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15-05-2018
Mathematics

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For f(x) = 2x + 1 and g(x) = x2 – 7, find (f – g)(x).

A. –x^2 + 2x – 6
B. –x^2 + 2x + 8
C. x^2 – 2x – 8
D. 2x^2 – 15

Respuesta :

15-05-2018

f(x) = 2x + 1; g(x) = x² - 7

(f - g)(x) = (2x + 1) - (x² - 7) = 2x + 1 - x² + 7 = -x² + 2x + 8

Answer: B. -x² + 2x + 8

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