4(2x-3)^2-9(y+1)^2 factorise with explanation and fast
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Step-by-step explanation:
use formula (a-b)²=a²-2ab+b² and
(a+b)²=a²+2ab+b²
=4(4x²+9-12x)-9(y²+2y+1)
=(16x²+36-48x)-(9y²+18y+9)
=(4x-6)²-(3y+3)²
=(4x-6)(4x-6)-(3y+3)(3y+3)
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