Question
Factorise the following:$x^2y^2 + 15xy - 16$
✓
Answer
$x^2y^2 + 15xy - 16$
$= x^2y^2 + 16xy - xy - 16$
$= xy(xy + 16) - 1(xy + 16)$
$= (xy + 16)(xy - 1).$
$= x^2y^2 + 16xy - xy - 16$
$= xy(xy + 16) - 1(xy + 16)$
$= (xy + 16)(xy - 1).$
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