(5x²-2x3)(5x²-14x)
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Step-by-step explanation:
(x-a)(x-b)=x²-x(a+b)-ab.
(5x²-2x3)(5x²-14x)=(5x²)²-5x²(2x³+14x)-(2x³)(14x)
=>5x⁴-10x⁵-90x³-28x³
=>5x⁴-10x⁵-118x³.
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