Nairaland Mathematics Clinic - Education (154)

Nairaland Mathematics Clinic - Education (154) - Nairaland

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Re: Nairaland Mathematics Clinic by hardedeji1(m): 10:36am On Oct 23, 2014

Re: Nairaland Mathematics Clinic by hardedeji1(m): 10:36am On Oct 23, 2014

and here is another!

Re: Nairaland Mathematics Clinic by Temieasy(m): 12:55pm On Oct 23, 2014

[quote author=rhydex247 post=27370292][/quote]Thanks boss

Re: Nairaland Mathematics Clinic by Temieasy(m): 12:56pm On Oct 23, 2014

rhydex247:
[/quote]Thanks boss
[quote author=rhydex247 post=27370292]

Thanks

Re: Nairaland Mathematics Clinic by ValentineMary(m): 12:24pm On Oct 25, 2014

benbuks:
take natural logarithm of both sides

=> lny =xlnx

differentiating implicitly wrt. x

we have 1/y dy/dx = lnx + x/x

=> dy/dx= f '( x) = y ( lnx +1 )

but y=x^x

hence f ' (x) = x^x (lnx +1 )

that's it

guy u are good.

Re: Nairaland Mathematics Clinic by factorial1(m): 3:52pm On Oct 25, 2014

If the position vectors A and B are (i + 2j + 4k) and (2i + 3j + 5k), find the position vector of point C that divide AB in the ratio 2:3. Find also the midpoint of AB.

P.S... now on break, guess I should be more frequent here now.

Re: Nairaland Mathematics Clinic by Nobody: 1:47pm On Oct 26, 2014

ValentineMary:
guy u are good.

God is good.

Re: Nairaland Mathematics Clinic by Nobody: 1:50pm On Oct 26, 2014

hmmm...see questions abeg. hmm

greet thee all .

#shalom.

Re: Nairaland Mathematics Clinic by happyday: 8:43pm On Oct 26, 2014

Kovic08:
Please what is the formular for calculating percentage error

% error = error/true value x 100%
where error = measured value - true value.

E.g. A stick of lenght 1.75m was measured by a student as 1.8m.
Error = 1.8 - 1.75m = 0.05m.
% error = 0.05/1.75 x 100% = ...

Re: Nairaland Mathematics Clinic by tuwayz(m): 2:40pm On Oct 30, 2014

Find the equation of the straight line through (-2,3) and perpendicular to 4x + 3y - 5=0

Re: Nairaland Mathematics Clinic by Nastydroid(m): 4:15pm On Oct 30, 2014

tuwayz:
Find the equation of the straight line through (-2,3) and perpendicular to 4x + 3y - 5=0

y-4x-11=0

Re: Nairaland Mathematics Clinic by factorial1(m): 5:25pm On Oct 30, 2014

Nastydroid:
y-4x-11=0

The ans. is 4y - 3x = 18

Re: Nairaland Mathematics Clinic by Nastydroid(m): 5:27pm On Oct 30, 2014

factorial1:
The ans. is 4y - 3x = 18

thanks bro,i will try it again

Re: Nairaland Mathematics Clinic by factorial1(m): 5:29pm On Oct 30, 2014

factorial1:
If the position vectors A and B are (i + 2j + 4k) and (2i + 3j + 5k), find the position vector of point C that divide AB in the ratio 2:3. Find also the midpoint of AB.

P.S... now on break, guess I should be more frequent here now.

Re: Nairaland Mathematics Clinic by Nastydroid(m): 5:55pm On Oct 30, 2014

factorial1:
The ans. is 4y - 3x = 18

i made a mistake with d gradient..am on track now grin

Re: Nairaland Mathematics Clinic by factorial1(m): 6:15pm On Oct 30, 2014

Nastydroid:
i made a mistake with d gradient..am on track now

thought as much.

Re: Nairaland Mathematics Clinic by Nzecorneboy: 8:27pm On Oct 30, 2014

gurus oya solve for A,B,C,D
2A+C=0
3A+2B+D=3
A+3B+C=2
B+D=-1

Re: Nairaland Mathematics Clinic by tuwayz(m): 11:07am On Oct 31, 2014

factorial1:
The ans. is 4y - 3x = 18

you are correct but you have to show your working

Re: Nairaland Mathematics Clinic by tuwayz(m): 11:16am On Oct 31, 2014

Nzecorneboy:
gurus oya solve for A,B,C,D
2A+C=0
3A+2B+D=3
A+3B+C=2
B+D=-1

The solution is kind of long for typing but my finals answers are A =4/13, B=2/13, C=-8/13 , D=-15/13

Re: Nairaland Mathematics Clinic by SirChides(m): 7:43am On Nov 02, 2014

factorial1:
If the position vectors A and B are (i + 2j + 4k) and (2i + 3j + 5k), find the position vector of point C that divide AB in the ratio 2:3. Find also the midpoint of AB.

P.S... now on break, guess I should be more frequent here now.

[3(I+2j+4k)+2(2i+3j+5k)]/(2+3).
=[3i+6j+12k+4i+6j+10k]/5.
=[7i+12j+22k]/5.
guess u can do d latter quest

Re: Nairaland Mathematics Clinic by jackpot(f): 1:10pm On Nov 02, 2014

factorial1:
If the position vectors A and B are (i + 2j + 4k) and (2i + 3j + 5k), find the position vector of point C that divide AB in the ratio 2:3. Find also the midpoint of AB.

P.S... now on break, guess I should be more frequent here now.

just take the average of those two guys. The midpoint then becomes 1.5i+2.5j+4.5k.

Re: Nairaland Mathematics Clinic by jackpot(f): 5:07pm On Nov 02, 2014

ooh, my benbuks. Where art thou?

Re: Nairaland Mathematics Clinic by rhydex247(m): 3:58pm On Nov 04, 2014

Solve.
A rigid body whose principal moment of inertia are A,A,3A is in motion with no forces acting. At the instant t=0, the angular velocity (w) of the body referred to the principal axes as coordinates axes are (2n,3n,n). Find angular velocity (w) at any subsequent time.

Re: Nairaland Mathematics Clinic by emmyeuler1: 10:47pm On Nov 04, 2014

please maths generals help me out......benbuks,jackpot,rhydex,calculus fx,efficiency,laplacian........

Re: Nairaland Mathematics Clinic by Laplacian(m): 7:28am On Nov 05, 2014

emmyeuler1:
please maths generals help me out......benbuks,jackpot,rhydex,calculus fx,efficiency,laplacian........

Re: Nairaland Mathematics Clinic by Laplacian(m): 7:42am On Nov 05, 2014

Here's question 1.)

Re: Nairaland Mathematics Clinic by Laplacian(m): 7:46am On Nov 05, 2014

Contd.

Re: Nairaland Mathematics Clinic by 2mNaira: 6:31pm On Nov 06, 2014

Please can anyone help me with the solution to this simultaneous equation?

d1 squared = (x - x1)squared + (y - y1)squared .....equation1
d2 squared = (x - x2)squared + (y - y2)squared .....equation2

where d1,d2,x1,x2,y1 and y2 are all constants

The solution should be given in terms of d1,d2,x1,x2,1,y2.

Thanks a lot.

P.S.
I was directed to this thread form the the thread :
https://www.nairaland.com/1984138/someone-me-solving-simultaneous-equation#27778957

Re: Nairaland Mathematics Clinic by Laplacian(m): 8:21pm On Nov 06, 2014*

mnairaland:
Please can anyone help me with the solution to this simultaneous equation?

d1 squared = (x - x1)squared + (y - y1)squared .....equation1
d2 squared = (x - x2)squared + (y - y2)squared .....equation2

where d1,d2,x1,x2,y1 and y2 are all constants

The solution should be given in terms of d1,d2,x1,x2,1,y2.

Thanks a lot.

P.S.
I was directed to this thread form the the thread :
https://www.nairaland.com/1984138/someone-me-solving-simultaneous-equation#27778957

this can be solved either geometrically or algebraically. By geometry, it is easier since u are required to find the coordinate of intersection of two circles. Here's an algebraic proof;
d₁²=(x-x₁)²+(y-y₁)².......eqn1

d₁²=(x-x₁+x₂-x₂)²+(y-y₁+y₂-y₂)²

d₁²=(x-x₂+(x₂-x₁))²+(y-y₂+(y₂-y₁))²
or
d₁²=(x-x₂)²+2(x-x₂)(x₂-x₁)+(x₂-x₁)²+(y-y₂)²+2(y-y₂)(y₂-y₁)+(y₂-y₁)²

substitute equation (2) in this last eqn and call it eqn (3), equation (3) will involve (x-x₂) and (y-y₂). From equation (3), substitute for (y-y₂) in eqn (2) and solve the resulting quadratic in (x-x₂)

bros, the alphabet involved is too much, so dont expect the final solution here

Re: Nairaland Mathematics Clinic by Calculusfx: 11:17pm On Nov 08, 2014

rhydex247:
Solve dis.
1. Electric vector E of an
electromagnetic wave in a free space
is given by Ex=Ez=0, and Ey=Acosw
(t- z/c). By using the maxwell's
equation for a free space, determine
the expression for the components of
H.

...smile,master rhydex,i wish i had ur time,so busy these days,all the way...my greetings to all the generals on the thread,JACKPOT,LAPLACIAN,BENBUKS,RHYDEX,FACTORIAL and others.

Re: Nairaland Mathematics Clinic by Skykid1208(m): 8:13am On Nov 09, 2014

Richiez:
@calebsworld, here are a fewtips;
1. you have to develop a great interest for maths, and have that strong desire to become a maths guru.

2. Realize that there's nothing magic about mathematics.

3. make friends with people who appreciate mathematics.

4. practise as many maths questions as possible, starting from the very simple ones to more complex ones. develop the urge to solve them on your own, but you can always seek for assistance whenever you get hooked.

5. do not forget any new thing you have learnt, keep reviewing them.

6. learn to memorize some basic maths formulas as this will build your confidence.

GOOD LUCK

Thanks

Re: Nairaland Mathematics Clinic by Skykid1208(m): 8:16am On Nov 09, 2014

Richiez:
@calebsworld, here are a fewtips;
1. you have to develop a great interest for maths, and have that strong desire to become a maths guru.

2. Realize that there's nothing magic about mathematics.

3. make friends with people who appreciate mathematics.

4. practise as many maths questions as possible, starting from the very simple ones to more complex ones. develop the urge to solve them on your own, but you can always seek for assistance whenever you get hooked.

5. do not forget any new thing you have learnt, keep reviewing them.

6. learn to memorize some basic maths formulas as this will build your confidence.

GOOD LUCK

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