Factor.
-$$x ^ { 2 } + 7 x y - 120 y ^ { 2 }$$
A) $( x + 15 y ) ( x - 8 y )$
B) $( x - y ) ( x + 8 y )$
C) $( x - 15 y ) ( x + y )$
D) $( x - 15 y ) ( x + 8 y )$

Question

Quizplus · Accepted Answer

The correct factorization is found by looking for two numbers that multiply to $-120y^2$ and add to $7y$. Those numbers are $15y$ and $-8y$, leading to the factors $(x + 15y)$ and $(x - 8y)$.

Factor - x2+7xy−120y2x ^ { 2 } + 7 x y - 120 y ^ { 2 }x2+7xy−120y2

Factor
- $x ^ { 2 } + 7 x y - 120 y ^ { 2 }$