Question
Factorise:
15x2 - x - 28
15x2 - x - 28
✓
Answer
15x2 - x - 28
= 15x2 + 20x - 21x - 28
= 5x(3x + 4) - 7(3x + 4)
= (3x + 4)(5x - 7)
= 15x2 + 20x - 21x - 28
= 5x(3x + 4) - 7(3x + 4)
= (3x + 4)(5x - 7)
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