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f ' (x) = ((x-8)*(2x^2 +x +4) = (x - 8)' * (2x^2 + x + 4) + (x - 8) * (2x^2 +x + 4)'=
= 1 * (2x^2 + x + 4) + (x - 8) * (2 * 2x + 1) =
= 2x^2 + x + 4 + 4x^2 + x - 32x - 8=
= 6x^2 - 30x - 4
Ответ. 6x^2 - 30x - 4