abdullahkh abdullahkh

12-12-2020
Mathematics

contestada

If f(x)=49-x^2 and g(x)=7-x, which is the rule of the function (f-g)(x)?

A. -x^2-x-56
B. -x^2+x+42
C. 7+x
D. x^3-7x^2-49x=343

Respuesta :

jimrgrant1 jimrgrant1

12-12-2020

Answer:

B

Step-by-step explanation:

(f - g)(x) = f(x) - g(x), then

f(x) - g(x)

= 49 - x² - (7 - x) ← distribute by - 1

= 49 - x² - 7 + x ← collect like terms

= - x² + x + 42 → B

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