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Given the functions [tex]\( f(x) = 3x^2 - 7 \)[/tex] and [tex]\( g(x) = x^3 + 1 \)[/tex], evaluate [tex]\( f(g(2)) \)[/tex].

A. 45
B. 145
C. 236
D. 326

Sagot :

GinnyAnswer
To evaluate [tex]\( f(g(2)) \)[/tex] given the functions [tex]\( f(x) = 3x^2 - 7 \)[/tex] and [tex]\( g(x) = x^3 + 1 \)[/tex], follow these steps:

1. Evaluate [tex]\( g(2) \)[/tex]:
[tex]\[ g(x) = x^3 + 1 \][/tex]
Substitute [tex]\( x = 2 \)[/tex]:
[tex]\[ g(2) = 2^3 + 1 = 8 + 1 = 9 \][/tex]

2. Now use the result of [tex]\( g(2) \)[/tex] to evaluate [tex]\( f(g(2)) \)[/tex]:
[tex]\[ f(x) = 3x^2 - 7 \][/tex]
Substitute [tex]\( x = g(2) \)[/tex] or [tex]\( x = 9 \)[/tex]:
[tex]\[ f(9) = 3(9^2) - 7 \][/tex]
Calculate [tex]\( 9^2 \)[/tex]:
[tex]\[ 9^2 = 81 \][/tex]
Substitute back into the expression for [tex]\( f(9) \)[/tex]:
[tex]\[ f(9) = 3 \cdot 81 - 7 \][/tex]
Calculate the multiplication:
[tex]\[ 3 \cdot 81 = 243 \][/tex]
Subtract 7:
[tex]\[ 243 - 7 = 236 \][/tex]

So, the correct evaluation of [tex]\( f(g(2)) \)[/tex] is [tex]\( 236 \)[/tex].

Therefore, the answer is [tex]\( 236 \)[/tex].
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