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02-08-2017
Mathematics

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Given f(x) = x2 + 4x − 1 and g(x) = 5x − 7, identify (fg)(x).

Given fx x2 4x 1 and gx 5x 7 identify fgx class=

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choixongdong choixongdong

02-08-2017

f(x) = x^2 + 4x − 1 and g(x) = 5x − 7
(fg)(x) = (x^2 + 4x − 1)(5x − 7)
(fg)(x) = 5x^3 + 20x^2 - 5x - 7x^2 - 28x + 7
(fg)(x) = 5x^3 + 13x^2 - 33x + 7

answer is C. third choice

(fg)(x) = 5x^3 + 13x^2 - 33x + 7

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