Question
Solve
$(x+y a)^2-(a-b)^2$
$(x+y a)^2-(a-b)^2$
✓
Answer
$(x+y a)^2-(a-b)^2$
$=[(x+y)-(a-b)][(x+y)+(a-b)]$
$=(x+y-a+b)(x+y+a-b)$
$=[(x+y)-(a-b)][(x+y)+(a-b)]$
$=(x+y-a+b)(x+y+a-b)$
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