factorise 16x²-4a²+12ab-9b²
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Step-by-step explanation:
Inverse sign:
-16x²+4a²-12ab+9b²
(4a²-12ab+9b²)-16x²
{(2a)²-2.2a.3b+(3b)²}-16x²
(2a-3b)²-16x²
(2a-3b)²-(4x²)
(2a-3b+4x)(2a-3b-4x)
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