Solve the equation using factoring. x2 + 8x - 20 = 0
Anwsers:
{-2, -10}
{2, 10}
{-2, 10}
{2, -10

Question

Solve the equation using factoring. x2 + 8x - 20 = 0
Anwsers: 
   {-2, -10} 
   {2, 10} 
   {-2, 10} 
   {2, -10

anonymous · Answer

Find the two numbers that multiply to -20, and add to +8.

anonymous · Answer

i think i got it...-2, 10?

anonymous · Answer

But then that represents (x-2)(x+10) = x^2 + 8x - 20, so we aren't done yet.

anonymous · Answer

aww. no more medals for wrong answers?

anonymous · Answer

Then we need to solve x-2 = 0, and x+10 = 0

anonymous · Answer

yes.. they try lol

anonymous · Answer

I can assure you is one of those ;D keep thinking :p

anonymous · Answer

@dpaInc  LOL ,  I would vote for the quadratic equation formula, it always works!

$$\Large x_{1/2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$
in your case you have to substitute ...
a=1
b=8
c=-20

calculate , and there's nothing else to get confused O_O

anonymous · Answer

that is definitely right...