Factorise a) 25a²b² - 9 p²q²
b) 2x²-35x-18
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(a) 25a²b² - 9p²q²
= (5ab)² - (3pq)²
= (5ab+3pq)(5ab-3pq).
(b) 2x² - 35x - 18
= 2x² + x - 36x - 18
= x(2x+1)-18(2x+1)
= (2x+1)(x-18).
= (5ab)² - (3pq)²
= (5ab+3pq)(5ab-3pq).
(b) 2x² - 35x - 18
= 2x² + x - 36x - 18
= x(2x+1)-18(2x+1)
= (2x+1)(x-18).
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