Factorize.
a)(x+y)² - (x-y)²
b)2x³+x²-4x
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a) (x+y)² - (x-y)². @[a²-b²]
= x²+y²+2xy + x² + y² -2xy
= 2x² + 2y²
b) 2x³ + x² -4x
= x²(2x+1) -4x. or x(2x²+x-4)
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