Question

1. evaluate the expression 4a² + 2a - 4 when a = 3

a. 68
b. 46
c. 38
d. 26

Explanation:

Step1: Substitute \( a = 3 \) into the expression \( 4a^2 + 2a - 4 \)

First, calculate \( a^2 \) when \( a = 3 \): \( 3^2 = 9 \)
Then, calculate \( 4a^2 \): \( 4\times9 = 36 \)
Next, calculate \( 2a \): \( 2\times3 = 6 \)

Step2: Combine the terms

Now, substitute these values back into the expression: \( 36 + 6 - 4 \)
First, add \( 36 \) and \( 6 \): \( 36 + 6 = 42 \)
Then, subtract \( 4 \) from \( 42 \): \( 42 - 4 = 38 \)

Answer:

c. 38