factorise 25(x+y)²-(x-y) ²
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25(x+y)² - (x-y)²= 24(x+y)² + (x+y)² - (x-y)²
= 24 (x+y)² + 4xy
= 24x² + 2×24xy + 24 y²+ 4xy
= 24x²+ 48xy + 24y² + 4xy
= 24x² + 52xy + 24y²
= 4 ( 6x² + 13xy + 6y²)
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