Question

find f(4) when f(x)=x² - 5x - 7.
a. 29
b. -11
c. 43
d. 3

Explanation:

Step1: Substitute x = 4 into f(x)

To find \( f(4) \), we substitute \( x = 4 \) into the function \( f(x)=x^{2}-5x - 7 \). So we get \( f(4)=4^{2}-5\times4 - 7 \).

Step2: Calculate each term

First, calculate \( 4^{2}=16 \), then \( 5\times4 = 20 \). Now the expression becomes \( 16-20 - 7 \).

Step3: Perform the arithmetic operations

First, \( 16-20=-4 \), then \( -4 - 7=-11 \).

Answer:

B. -11