8x^3-2x^2y-15xy^2 factorise
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Ans: x(2x-3y)(4x+5y)
sol:
8x³-2x²y-15xy²
=> (2x)³-12x²y+10x²y-15xy²
=> 4x²(2x-3y)+5xy(2x-5y)
=> (2x-3y)(4x²+5xy)
=> x (2x-3y) (4x+5y)
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