If $f ( x ) = x ^ { 3 } + 2 x - 1$ , find $f ( a )$
A) $a ^ { 3 } + 2 a - 1$
B) $2 a ^ { 3 } + a - 1$
6
C) $2 a ^ { 3 } + 3 a$
D) $4 a ^ { 3 }$
E) $2 a ^ { 3 } - a + 1$

Name: If $f ( x ) = x ^ { 3 } + 2 x - 1$ , find $f ( a )$ A) $a ^ { 3 } + 2 a - 1$ B) $2 a ^ { 3 } + a - 1$ 6 C) $2 a ^ { 3 } + 3 a$ D) $4 a ^ { 3 }$ E) $2 a ^ { 3 } - a + 1$
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Question

Quizplus · Accepted Answer

To find f(a), we simply need to replace all the x's in the function with a's. Therefore, we get f(a) = a^3 + 2a - 1. The answer is option A.

If f(x)=x3+2x−1f ( x ) = x ^ { 3 } + 2 x - 1f(x)=x3+2x−1

If $f ( x ) = x ^ { 3 } + 2 x - 1$