20x³+15x²+28 x-21 facterise
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we have
=20x^3 + 15x^2+ 28x - 21
=(2×2×5×X×X×X+3×5×X×X)-(2×2×7×X+3×7)
=5X(4X+3)-7(4X+3)
=(5X-7)(4X+3)
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