Question

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What is the coefficient of x^2 in (x-1)(x-1)(x-5)

Answer 1

Simply expand.

(x-1)² = x² + 1 - 2x

(x² + 1 - 2x)(x - 5)

x³ - 5x² + x - 5 -2x² + 10x

-7x² => -7 is coefficient.