Question

Evaluate 3x2 - 4 when x = 2.
A. 12
B. 32
c. 2
D. 8

Answer 1

`\text{Plug in and solve:}\\\\3(2)^2-4\\\\3(4)-4\\\\12-4\\\\8\\\\\boxed{\text{D). 8}}`

Answer 2

8

Explanation:

3x^2 - 4

Let x = 2

3 * 2^2 -4

Exponents first

3 *4 -4

Then multiply

12 -4

Now subtract

8