Question

e) what is the value of f(-5), if f(x) = -9x - 4?
i) 41
ii) -49
iii) -41
iv) 49

Explanation:

Step1: Substitute x = -5 into f(x)

Given \( f(x) = -9x - 4 \), we substitute \( x = -5 \) into the function. So we get \( f(-5) = -9\times(-5) - 4 \).

Step2: Calculate the multiplication

First, calculate \( -9\times(-5) \). Multiplying two negative numbers gives a positive result, so \( -9\times(-5) = 45 \). Now the expression becomes \( f(-5) = 45 - 4 \).

Step3: Calculate the subtraction

Subtract 4 from 45: \( 45 - 4 = 41 \).

Answer:

i) 41