Question

1. what is the value of the expression $2x^2 + x$, if $x$ is 3?

a. 9
b. 18
c. 21
d. 27

Explanation:

Step1: Substitute $x=3$ into expression

$2(3)^2 + 3$

Step2: Calculate the squared term

$2(9) + 3$

Step3: Compute multiplication then addition

$18 + 3$

Answer:

C. 21