Question

Find the value of f(–3) and g(3) if f(x) = –6x + 3 and g(x) = 3x + 21x^–3.
f(–3) = 21 g(3) = 9.78
f(–3) = –18 g(3) = –9.78
f(–3) = –3 g(3) = 30.04
f(–3) = 15 g(3) = 8.22

Answer 1

Answer:

f(-3)=21

Step-by-step explanation:

Plug in -3 for x. -6•-3=18. 18+3=21.

Answer 2

Answer:

f(–3) = 21 g(3) = 9.78

Step-by-step explanation:

Given functions,

$f(x) = -6x + 3-----(1)$

$g(x)=3x+21x^{-3}-----(2)$

Put x = -3 in equation (1),

$f(3) = -6(-3) + 3 = 18 + 3 = 21$

Put x = 3 in equation (2),

$g(3) = 3(3) + 21 (3)^{-3}=9 + \frac{21}{3^3}=9+\frac{21}{27}=9.777778\approx 9.78$

Hence, first option is correct.