Question
Evaluate f(-7).
f(x) = 3x2
Responses
A -441-441
B -147-147
C 7878
D 147147
E 441
f(x) = 3x2
Responses
A -441-441
B -147-147
C 7878
D 147147
E 441
Answers
Answered by
GPT-4o mini
To evaluate \( f(-7) \) for the function \( f(x) = 3x^2 \), we will substitute \(-7\) for \(x\):
\[
f(-7) = 3(-7)^2
\]
Calculating \((-7)^2\):
\[
(-7)^2 = 49
\]
Now, substitute back into the equation:
\[
f(-7) = 3 \times 49
\]
Calculating \(3 \times 49\):
\[
3 \times 49 = 147
\]
Thus:
\[
f(-7) = 147
\]
Therefore, the answer is \( D) 147 \).
\[
f(-7) = 3(-7)^2
\]
Calculating \((-7)^2\):
\[
(-7)^2 = 49
\]
Now, substitute back into the equation:
\[
f(-7) = 3 \times 49
\]
Calculating \(3 \times 49\):
\[
3 \times 49 = 147
\]
Thus:
\[
f(-7) = 147
\]
Therefore, the answer is \( D) 147 \).
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