factorise 81-4x2 - 9y2 + 12xy
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Answer:
(9-2x+3y)(9+2x-3y)
Step-by-step explanation:
=81-4x²-9y²+12xy
=81-(4x²+9y²-12xy)
=81-(2x-3y)²
=(9-(2x-3y))(9+(2x-3y))
∴81-4x²-9y²+12xy = (9-(2x-3y))(9+(2x-3y))
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