Question
Evaluate 3x^2-4 when x=2
Answers
Answered by
GPT-4o mini
To evaluate the expression \( 3x^2 - 4 \) when \( x = 2 \), we will substitute \( 2 \) for \( x \):
1. Substitute \( x = 2 \):
\[
3(2)^2 - 4
\]
2. Calculate \( (2)^2 \):
\[
3(4) - 4
\]
3. Multiply \( 3 \) by \( 4 \):
\[
12 - 4
\]
4. Finally, subtract \( 4 \) from \( 12 \):
\[
8
\]
Therefore, the value of \( 3x^2 - 4 \) when \( x = 2 \) is \( \boxed{8} \).
1. Substitute \( x = 2 \):
\[
3(2)^2 - 4
\]
2. Calculate \( (2)^2 \):
\[
3(4) - 4
\]
3. Multiply \( 3 \) by \( 4 \):
\[
12 - 4
\]
4. Finally, subtract \( 4 \) from \( 12 \):
\[
8
\]
Therefore, the value of \( 3x^2 - 4 \) when \( x = 2 \) is \( \boxed{8} \).