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## anonymous one year ago Solve for x: 2 over 5 (x − 4) = 2x.

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1. anonymous

$\frac{2}{5(x-4)}=2x$ multiply both sides by 5(x-4) $\frac{2}{5(x-4)}*5(x-4)=2x*5(x-4)$

2. anonymous

simplify 2=10x(x - 4)

3. anonymous

thx

4. anonymous

will you continue on your own?

5. anonymous

i forgot how to simplify

6. anonymous

how do you forget how to simplify

7. anonymous

idk i forgot

8. anonymous

can someone please help?

9. campbell_st

by simplifying all you need to do is ditribute the 10x so $2 = 10x^2 -40x$ rewrite the equation and you get $10x^2 - 40x - 2 = 0$ so you can now solve for x, using the general quadratic formula so make it a little easier, divide every term by 2 $5x^2 - 20x - 1 = 0$

10. anonymous

i got 13

11. anonymous

am i wrong?

12. campbell_st

well given its a quadratic equation, you need 2 answers... and you need the formula $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ you have a = 5, b = -20 and c = -1

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