Question
Factorise : $x^2 - 11x - 80$
✓
Answer
$x^2 - 11x - 80$
$= x^2 - 16x + 5x - 80$
$= x(x - 16) + 5(x - 16)$
$= (x - 16)(x + 5)$
$= x^2 - 16x + 5x - 80$
$= x(x - 16) + 5(x - 16)$
$= (x - 16)(x + 5)$
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