₦airaland Forum

Xup Agent of change.Pls which textbook can i get solution to a 4 by 4 matrix.

benji93:
(12345678*12345678)-(12345676*12345680)

[quote author=Tpappie post=31244609][/quote]Let 12345678 = w
The question can be written as
w*w - (w - 2)(w + 2)
w*w - (w*w - 4)
w*w - w*w + 4
4

Onase:
Xup Agent of change.Pls which textbook can i get solution to a 4 by 4 matrix.

don't really know bro. ...u cud browse online sir .

agentofchange1:
We know little about this Greek mathematician from Alexandria, called the father of algebra, except that he lived around 3rd century A.D. Thanks to an admirer of his, who described his life by means of an algebraic riddle, we know at least something about his life.
Diophantus's youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life Diophantus got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus's life. Diophantus died 4 years after the death of his son. How long did Diophantus live?

This sums up Diophantis's time line, so, let's dig in;

1/6(x)+1/12(x)+1/7(x)+5+1/2(x)+4=x

(x)-75/84(x)=9
9/84(x)=9
x=84 years

I jumped simple steps as I am typing on phone.

yoji:
Pls gurus I need help with this situation:
A car of costing 1,750,000 is to b used for 3yrs after which its to b sold off at quarter d price(437,500).if it was used for 4yrs and 3mnths, hw much shud it b sold??

.

question sims wrong, cos in 4 yrs 3 mths it would we worth nothing in fact you'd be losing money.

ositadima1:
This sums up Diophantis's time line, so, let's dig in;

1/6(x)+1/12(x)+1/7(x)+5+1/2(x)+4=x

(x)-75/84(x)=9
9/84(x)=9
x=84 years

I jumped simple steps as I am typing on phone.

good boy.

so this thread is still alive?

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pls some1 should help with dis.
find d nth derivative of x^x.
thanks in anticipation

rashywire:
pls some1 should help with dis.
find d nth derivative of x^x.
thanks in anticipation

dy/dx=x^x{lnx+1}

agentofchange1:
you should at least post a question on it , could help more , we're not being paid for solving questions here . just sacrificing time /energy /MB. to see we help when chanced . u sit there asking Y , as if. u kept us here ..haba ..let's be considerate . one good turn deserves another .
hope u get ma gist bro.
1luv.

agentofchange am sorry

I need u guys help again. I want u to explain moment generating function

rashywire:
pls some1 should help with dis.
find d nth derivative of x^x.
thanks in anticipation

let y = x^x
take 1n of both sides
1n y = 1n x^x
1n y = x 1n x
[dy/dx][1/y] = 1 + 1n x
dy/dx = y [1 + 1nx]
dy/dx = x^x [1 + 1nx].
Note: 1n also means log to base e.

Videx1:
agentofchange am sorry

its OK man , we're cool.

happy Sunday .

thankyouJesus:
let y = x^x
take 1n of both sides
1n y = 1n x^x
1n y = x 1n x
[dy/dx][1/y] = 1 + 1n x
dy/dx = y [1 + 1nx]
dy/dx = x^x [1 + 1nx].
Note: 1n also means log to base e.

hmm u try bro , but not it . d guy said nth derivative & not first derivative .

have u heard of Leibniz's theorem .?

Videx1:
I need u guys help again. I want u to explain moment generating function

For a given random variable say X

moment generating function , (mgf)

for discrete case , having some density function , f(x)


mgf , m(t) = E[e^tx ] = £ e^tx * f(x) .


(£ : represents sigma. for summation )

& for continuous case ,

m(t)= $ e^tx *f(x) dx

over some given range space of X

($: represents integral sign ) .

bring up questions on it for more clarity & comprehension.

agentofchange1:
hmm u try bro , but not it . d guy said nth derivative & not first derivative .

have u heard of Leibniz's theorem .?

yeah, but I don't know it.

thankyouJesus:
yeah, but I don't know it.

OK

here

given f(x) = u(x)v(x) ,

fⁿ (x) = £ nCr * u^(r) *v^(n-r)

for r=1 , 2 , 3 , . . . , n

(£ : represents sigma notation used for summation

C: represents Combination

u& v are functions of x

that's it , hope u get ?

joywendy:
so this thread is still alive?

sure! , u want it dead .?

agentofchange1:
sure! , u want it dead .?

lol...haba no....i used to follow the thread silently back in the day been long i ve been here.

agentofchange1:
OK

here

given f(x) = u(x)v(x) ,

fⁿ (x) = £ nCr * u^(r) *v^(n-r)

for r=1 , 2 , 3 , . . . , n

(£ : represents sigma notation used for summation

C: represents Combination

u& v are functions of x

that's it , hope u get ?

yeah, thank you. How come?

agentofchange1:
For a given random variable say X

moment generating function , (mgf)

for discrete case , having some density function , f(x)


mgf , m(t) = E[e^tx ] = £ e^tx * f(x) .


(£ : represents sigma. for summation )

& for continuous case ,

m(t)= $ e^tx *f(x) dx

over some given range space of X

($: represents integral sign ) .

bring up questions on it for more clarity & comprehension.

thanks

thankyouJesus:
yeah, thank you. How come?

1 (first derivative) , 2 ( second derivative) . . . e.t.c up to nth derivative .


try get college maths vol. 2 or engineering math by h.k dass o r surf the net 4 more understanding .

joywendy:
lol...haba no....i used to follow the thread silently back in the day been long i ve been here.

yea ..miss/Mrs. joy . I know that , just kidding .

Videx1:
thanks

UWC man.

agentofchange1:
1 (first derivative) , 2 ( second derivative) . . . e.t.c up to nth derivative .


try get college maths vol. 2 or engineering math by h.k dass o r surf the net 4 more understanding .

Thank you sire.
If I can get you properly, the [d/dx][sinx cosx] to nth derivative is . . . . . . . . . .ⁿC₀sin⁰x cos^n-0x + ⁿC₁sinx cos^n-1 + . . . + ⁿC_nsinⁿx cos⁰x

[color=#990000][/color]
The roots of the equation x^2+9x+k=0 are a (i.e alpha ) and a+1(i.e. Alpha + 1); The value of K is : (a) 9 (b) 10 (c) 11 (d) 12



Please gurus help as na ma test be that

Emdee590:
[color=#990000][/color]
The roots of the equation x^2+9x+k=0 are a (i.e alpha ) and a+1(i.e. Alpha + 1); The value of K is : (a) 9 (b) 10 (c) 11 (d) 12



Please gurus help as na ma test be that

OK recheck the question/options.

sure its correct ?

cus. m getting k=20 .

agentofchange1:
OK recheck the question/options.

sure its correct ?

cus. m getting k=20 .

Yes you're right!

The options are all wrong!

α = 4 and α + 1 = 5

Which makes the equation => x² + 9x + 20

And K = 20

doubleDx:
Yes you're right!

The options are all wrong!

α = 4 and α + 1 = 5

Which makes the equation => x² + 9x + 20

And K = 20

yes boss , thought as much

welcome back prof.

its me benbuks. ur boy.

where hast thou bin sir ?.

agentofchange1:
yes boss , thought as much

welcome back prof.

its me benbuks. ur boy.

where hast thou bin sir ?.

Wow! General benbuks, is that you? You've don't a great job here bruv....Good to see you guys keeping the thread alive! That's the spirit; keep up the good work guys. God bless y'all!

I have been kinda busy lately so I check around once in a while, but will start contributing soon!

I like this your new moniker sha, nice one!

Nice work people!

Hi chief General Ositadima1; nice to have you back! Hailings bruv!

doubleDx:
Yes you're right!

The options are all wrong!

α = 4 and α 1 = 5

Which makes the equation => x² 9x 20

And K = 20

Thank you guys for a job well done. The question and options are okay . I solved and also getting k=20 so I think d question gat no option of that thank you all