Question
Solve:
$(2 a-b)^2-16 c^2$
$(2 a-b)^2-16 c^2$
✓
Answer
$(2 a-b)^2-16 c^2 $
$=(2 a-b)^2-(4 c)^2$
$=[(2 a-b)-4 c][(2 a-b)+4 c]$
$=(2 a-b-4 c)(2 a-b+4 c)$
$=(2 a-b)^2-(4 c)^2$
$=[(2 a-b)-4 c][(2 a-b)+4 c]$
$=(2 a-b-4 c)(2 a-b+4 c)$
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