Factor.
-$81-126 x+49 x^{2}$
A) $(49 x-9)(x-9)$
B) $(7 x+9)^{2}$
C) Prime
D) $(7 x-9)^{2}$

Name: Factor. -$81-126 x+49 x^{2}$ A) $(49 x-9)(x-9)$ B) $(7 x+9)^{2}$ C) Prime D) $(7 x-9)^{2}$
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Question

Quizplus · Accepted Answer

This expression can be rewritten as $(7x)^2 - 2*(7x)*9 + 9^2$, which is a perfect square trinomial, factoring to $(7x - 9)^2$.

Factor - 81−126x+49x281-126 x+49 x^{2}81−126x+49x2 A) (49x−9)(x−9)(49 x-9)(x-9)(49x−9)(x−9) B) (7x+9)2(7 x+9)^{2}(7x+9)2 C) Prime D)