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8 by fanficgirl(f): 7:34pm On Aug 09, 2015 |
Re: 8 by shaboti: 7:47pm On Aug 09, 2015 |
3y + 2x = 4 |
Re: 8 by GMacbeth: 7:53pm On Aug 09, 2015 |
fanficgirl:2y=3x-2 y=3x/2-2/2 gradient=3/2. also (x;y) second gradient=y- -2/x-5 for perpendicular gradient m1xm2=-1 (y+2)/(x-5)×3/2=-1 3y+6/2x-10=-1 -2x+10=3y+6 3y+2x=10-6 3y+2x=4 sorry I made a mistake in picking my co-ordinate |
Re: 8 by fanficgirl(f): 7:54pm On Aug 09, 2015 |
Aww men I did it wrong then D: GMacbeth: |
Re: 8 by fanficgirl(f): 7:57pm On Aug 09, 2015 |
THANK YOU SO MUCH!! NOW Let me try and digest what you did.. GMacbeth: |
Re: 8 by shaboti: 7:59pm On Aug 09, 2015 |
fanficgirl:he z wrong |
Re: 8 by fanficgirl(f): 8:03pm On Aug 09, 2015 |
How do you do it right then? Yeah, isn't his gradient wrong? Sorry i'm mathmatically stupid... shaboti: |
Re: 8 by fanficgirl(f): 8:13pm On Aug 09, 2015 |
Wait I don't think he's wrong.. shaboti: |
Re: 8 by shaboti: 8:18pm On Aug 09, 2015 |
fanficgirl:I solved with a slightly diff method tho. dy/dx of 3x-2=3 is 3/2 (gradient) But for a line perpendicular to it, the gradient will be the negative inverse. Therefore 3/2 will change to -2/3. To find the eqn of the line, u can use this method Y-y' = m (X-x').. where m represents the gradient. Substituting.. Y+2=-2/3 (X-5) Y+2=-2X/3 + 10/3 3Y+6 =-2X+10 3Y+2X=10-6 3Y+2X=4 |
Re: 8 by fanficgirl(f): 9:04pm On Aug 09, 2015 |
Omg thank you so much! That made a lot more sense, thanks, I understand wow i'm so stupid if it was that simple. Lol do you mind helping me with a few more, sorry for asking.. shaboti: |
Re: 8 by fanficgirl(f): 9:16pm On Aug 09, 2015 |
Really sorry to bother you, and hope i'm not being really annoying but to graph the equaton y=-x^2(x+3)((x-1))^2 what would you do with the negative x^-2 squared? Or wold the graph start negative and then would go to -3 then slope down and then up to zero and then to 1 where it would end down again right? shaboti: |
Re: 8 by shaboti: 9:24pm On Aug 09, 2015 |
fanficgirl:I dont understand you question.. what are your range of values , and why did you add double brackets to x-1? |
Re: 8 by fanficgirl(f): 9:31pm On Aug 09, 2015 |
There isn't any range of values, thats the question and its just supposed to be a simple sketched graph. Sorry I meant to say that (x-1) is squared too with the brackets, should have done it better. shaboti: |
Re: 8 by shaboti: 9:41pm On Aug 09, 2015 |
fanficgirl:hmm.. as far as I know there shud be values to work with, or are you expected to just use your own values? Perhaps this is beyond me. |
Re: 8 by fanficgirl(f): 9:49pm On Aug 09, 2015 |
This is an example... shaboti:
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Re: 8 by shaboti: 10:09pm On Aug 09, 2015 |
fanficgirl:oh I see what you mean now, and yes I believe it will run through -3, through the origin nd den to +1 (-x)^2 =0 X=0 |
Re: 8 by fanficgirl(f): 10:18pm On Aug 09, 2015 |
Oh good so then its correct, thank you so much! But how would the graph be like if its an exponent like -5 ^(x-1)+3 shaboti: |
Re: 8 by Umartins1(m): 10:59pm On Aug 09, 2015 |
fanficgirl: 3x-2y =2 -2y= 2-3x y= -2/2 + 3x/2 M1= 3/2 When two lines are perpendicular, M1M2= -1 M2= -1/M1 M2= -1/ 3/2 M2 = -2/3 Equation of a line= y-y1= m (x-x1) y-(-2)= -2/3 (x-5) y+2 = -2/3 (x-5) 3(y+2) = -2(x-5) 3y+6= -2x+10 3y+2x+6-10=0 3y+2x-4=0 |
Re: 8 by fanficgirl(f): 11:01pm On Aug 09, 2015 |
Thanks! Yeah someone already helped me figure it out but glad its right. Umartins1: |
Re: 8 by Umartins1(m): 11:03pm On Aug 09, 2015 |
fanficgirl: The first person was wrong. |
Re: 8 by fanficgirl(f): 11:22pm On Aug 09, 2015 |
Oh, I thought it didn't matter which way it was simplified. So your simplified version is the definite correct way then? Umartins1: |
Re: 8 by shaboti: 11:23pm On Aug 09, 2015 |
fanficgirl:could not arrive at anything miss.. 5^(x-1)+3 =5^x * 5^-1 * 5^3 5^x=0 x=0? Dunno biko Btw what class are u in? |
Re: 8 by fanficgirl(f): 11:30pm On Aug 09, 2015 |
Calc, were supposed to be doing reviews from other years and its embarrassing that I can't remember how to do 90 percent of it... And oh its just supposed to be graphed not solved.. shaboti: |
Re: 8 by shaboti: 11:42pm On Aug 09, 2015 |
fanficgirl:hm. Secondary sch? |
Re: 8 by Umartins1(m): 11:46pm On Aug 09, 2015 |
fanficgirl: Check his final answer. My answer and the one of the guys that used differentiation are both correct. |
Re: 8 by fanficgirl(f): 11:49pm On Aug 09, 2015 |
Yes shaboti: |
Re: 8 by fanficgirl(f): 11:50pm On Aug 09, 2015 |
Oh good because that was the one I was referring to. Thanks! Umartins1: |
Re: 8 by shaboti: 11:57pm On Aug 09, 2015 |
fanficgirl:ss3 i guess? |
Re: 8 by GMacbeth: 1:34am On Aug 10, 2015 |
fanficgirl:yea I think I made a mistake in picking my x;y coordinates |
Re: 8 by fanficgirl(f): 2:12am On Aug 10, 2015 |
Yes shaboti: |
Re: 8 by fanficgirl(f): 2:13am On Aug 10, 2015 |
Thanks |
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