Question
page 27 of 28
Functions Practice
Complete this assessment to review what you've learned. It will not count toward your grade.
2 of 52 of 5 Items
Question
Find the value of the function y=3x2−21
when x=4
.(1 point)
y =
.
Functions Practice
Complete this assessment to review what you've learned. It will not count toward your grade.
2 of 52 of 5 Items
Question
Find the value of the function y=3x2−21
when x=4
.(1 point)
y =
.
Answers
GPT-4o mini
To find the value of the function \( y = 3x^2 - 21 \) when \( x = 4 \), you can substitute 4 for \( x \).
Here are the steps:
1. Substitute \( 4 \) for \( x \):
\[
y = 3(4)^2 - 21
\]
2. Calculate \( (4)^2 \):
\[
(4)^2 = 16
\]
3. Now multiply \( 3 \) by \( 16 \):
\[
3 \times 16 = 48
\]
4. Finally, subtract \( 21 \) from \( 48 \):
\[
y = 48 - 21 = 27
\]
So, the value of the function when \( x = 4 \) is \( y = 27 \).
Here are the steps:
1. Substitute \( 4 \) for \( x \):
\[
y = 3(4)^2 - 21
\]
2. Calculate \( (4)^2 \):
\[
(4)^2 = 16
\]
3. Now multiply \( 3 \) by \( 16 \):
\[
3 \times 16 = 48
\]
4. Finally, subtract \( 21 \) from \( 48 \):
\[
y = 48 - 21 = 27
\]
So, the value of the function when \( x = 4 \) is \( y = 27 \).