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Original Question
Find the value of the function y = 3x^2 when x =4Question
Find the value of the function y = 3x^2 - 21
when x =4
when x =4
Answers
GPT-4o mini
To find the value of the function \( y = 3x^2 - 21 \) when \( x = 4 \), we can substitute \( 4 \) for \( x \) in the equation.
\[
y = 3(4)^2 - 21
\]
Calculating \( (4)^2 \):
\[
(4)^2 = 16
\]
Now substituting that back into the equation:
\[
y = 3(16) - 21
\]
Calculating \( 3(16) \):
\[
3(16) = 48
\]
Now we have:
\[
y = 48 - 21
\]
Finally, calculating \( 48 - 21 \):
\[
y = 27
\]
Therefore, the value of the function when \( x = 4 \) is \( \boxed{27} \).
\[
y = 3(4)^2 - 21
\]
Calculating \( (4)^2 \):
\[
(4)^2 = 16
\]
Now substituting that back into the equation:
\[
y = 3(16) - 21
\]
Calculating \( 3(16) \):
\[
3(16) = 48
\]
Now we have:
\[
y = 48 - 21
\]
Finally, calculating \( 48 - 21 \):
\[
y = 27
\]
Therefore, the value of the function when \( x = 4 \) is \( \boxed{27} \).