Question
Factorise:
x2 - x - 156
x2 - x - 156
✓
Answer
x2 - x - 156
= x2 - 13x + 12x - 156
= x(x - 13) + 12(x - 13)
= (x - 13)(x + 12)
= x2 - 13x + 12x - 156
= x(x - 13) + 12(x - 13)
= (x - 13)(x + 12)
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