Question

If f(x) = -2x + 7 and g(x) = x^2 – 2, what is (f•g)(3)?

Answer 1

Answer:

= 7

Step-by-step explanation:

If f(x) = -2x + 7 and g(x) = x^2 – 2, what is (f•g)(3)?

(f. g) = (-2x + 7)(x² - 2)

= -2x (x² - 2) +7( x² -2)

=-2x³ + 4x + 7x² - 14

(f. g) (3) means when x = 3

= -2x³ +4x + 7x² - 14

= -2(3)³ + 4(3) + 7(3)² - 14

= -2(27) +12 +7(9) - 14

= -54 +12+63-14

=75 - 68

= 7

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Answer 2

Answer:

(f•g)(3) = -7

Step-by-step explanation:

f(x)=-2x + 7

g(x) = x^2 – 2

(f•g)(3) = -2(x² - 2) + 7

(f•g)(3) = -2x² + 4 +7

(f•g)(3) = -2x² + 11

(f•g)(3) = -2(3)² + 11

(f•g)(3) = -2(9) + 11

(f•g)(3) = -18 + 11

(f•g)(3) = -7