Question
Factorise:
$x^2-x-156$
$x^2-x-156$
✓
Answer
$x^2-x-156$
$=x^2-13 x+12 x-156$
$=x(x-13)+12(x-13)$
$=(x-13)(x+12)$
$=x^2-13 x+12 x-156$
$=x(x-13)+12(x-13)$
$=(x-13)(x+12)$
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