Factorise : (x2 - 5x - 14) (x2 - 5x + 6) + 64
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(x²-5x-14)(x²-5x+6)+64
x⁴-5x³+6x²-5x³+25x²-30x-14x²+70x-84+64
x⁴-10x³+17x²+40x-20
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