find the coefficient of x² in the following polynomials (x-1)(4x^2-5x-7)
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x(4x^2 - 5x -7) -1(4x^2 - 5x -7)
= 4x^3 - 5x^2 - 7x - 4x^2 + 5x + 7
= 4x^3 -9 x^2 - 2x + 7
So the coefficient of x^2 = -9
= 4x^3 - 5x^2 - 7x - 4x^2 + 5x + 7
= 4x^3 -9 x^2 - 2x + 7
So the coefficient of x^2 = -9
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