Question

If $ f(x) = 3x^2 + 5x - 7 $, find $ f(2) $.

• A. \( 9 \)
• B. \( 15 \)
• C. \( 7 \)
• D. \( 5 \)

Hint:

Remember: To evaluate a function at a specific point, substitute the value of \( x \) into the function and simplify.

Answer 1

The Correct Option is A

Step 1: Substitute \( x = 2 \) into the function
We are given the function \( f(x) = 3x^2 + 5x - 7 \). We need to find \( f(2) \). Substitute \( x = 2 \) into the function: \[ f(2) = 3(2)^2 + 5(2) - 7 \]
Step 2: Simplify the expression
\[ f(2) = 3(4) + 5(2) - 7 \] \[ f(2) = 12 + 10 - 7 \] \[ f(2) = 15 \]
Answer:
Therefore, \( f(2) = 15 \). So, the correct answer is option (2).