Solve the equation using factoring. x2 + 8x - 20 = 0
A. {-2, -10}
B. {2, 10}
C. {-2, 10}
D. {2, -10}

Question

Solve the equation using factoring. x2 + 8x - 20 = 0
	A.	{-2, -10}
	B.	{2, 10}
	C.	{-2, 10}
	D.	{2, -10}

mysesshou · Answer

(x-2)(x+10)
(x-2) = 0   and   (x+10)=0
x=2, x=-10

mysesshou · Answer

x2 + 8x - 20 = 0  
(-2)^2 + 8(-2) - 20 = 4 -16-20 = -32
(-10)^2 + 8(-10) - 20 = 100 - 80 - 20 = 0
(2)^2 + 8(2) - 20 = 4 + 16 - 20 = 0
I still get D. Someone pls message me to explain further. I'm confused why it is A.

across · Answer

$$x^2+8x-20=0\implies(x+10)(x-2)=0\implies x=-10\text{ or }2.$$mysesshou is right.

mysesshou · Answer

AlexisDelgado, we support D, with proven examples.   The End.   Bye everyone :)

anonymous · Answer

They're not. Sorry about that

amistre64 · Answer

x2 + 8x - 20 = 0

that -20 tells us we have different signed terms

+8 means that the smaller root is positive

anonymous · Answer

It is A. Here is my work.

amistre64 · Answer

lol, it does look like something id work out :)

amistre64 · Answer

check your sign in step 35