Factor. Check by multiplying.
-$7 x-21 y$
A) $3(7 x-7 y)$
B) $7(x-y)$
C) $7(x-21 y)$
D) $7(x-3 y)$

Name: Factor. Check by multiplying. -$7 x-21 y$ A) $3(7 x-7 y)$ B) $7(x-y)$ C) $7(x-21 y)$ D) $7(x-3 y)$
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Question

Quizplus · Accepted Answer

The expression $7x - 21y$ can be factored by taking out the greatest common factor, which is 7. This gives $7(x - 3y)$. Multiplying back, $7(x - 3y) = 7x - 21y$, which matches the original expression.

Factor Check by Multiplying 7x−21y7 x-21 y7x−21y A) 3(7x−7y)3(7 x-7 y)3(7x−7y) B) 7(x−y)7(x-y)7(x−y)

Factor Check by Multiplying $7 x-21 y$ A) $3(7 x-7 y)$ B) $7(x-y)$