Factorise (5a - 3b)^2 - 16b^2
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=(a+b)(a-b)
<(5a-3b)+4b><(5a-3b)-4b>
=(5a-3b+4b)(5a-3b-4b)
=(5a+b)(5a-7b)
(a-b)²= a²+b²-2ab
(25a²+9b²-30ab)-16b²
25a²+9b²-30ab-16b²
25a²-30ab-7b²
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