factorise (5x+4y)²-(3x-2y)²
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(5x+4y)²-(3x-2y)²
using identity- a²-b²=(a+b)(a-b)
(5x+4y)²-(3x-2y)² = (5x+4y+3x-2y)(5x+4y-3x+2y)
= 8x+2y × 2x+6y
= 16x²+4xy + 48xy+12y²
= 16x²+12y²+52xy
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