Chords easy question --Test tomorrow

May 2010
3
0
Normally i wouldn't ask someone to reply quickly, but my test i tomorrow
all help is gratfully appreiciated if you can answer it by midnight

I have made a picture of my problem.
 

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May 2010
3
0
Sorry i did not have tiime to explain my attempt:
5x2 =x(2x+1)
10 = 2x^2 + x
0 = 2x^2 + x - 10
2 / 0 = 2 / (x^2 + x - 10)
0 = x^2 + x - 10
0 = (x -10) (x + 1)
(split into two equation)
x = 10 <---
x = -1

In the end im left with x = 10, when in my textbook x = 2 ?
 
May 2010
3
0
There's no way you can do the answer for me?

i know i would learn better on my own but
i'v done 23/24 questions and i just need
you question done so i can understand what
i did wrong here
 

pickslides

MHF Helper
Sep 2008
5,237
1,625
Melbourne
\(\displaystyle 0 = 2x^2 + x - 10 \implies x =\frac{-1\pm\sqrt{1^2-4\times 2 \times -10}}{2\times 2}=\dots\)
 
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