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Question

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 =

.

Answer 1

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 \( y = 27 \).