What is the value of the expression below when x equals x=3?

Question

3x^2-2x-8

Answer 1

To find the value of the expression when x=3, substitute 3 in place of x:

3(3)^2 - 2(3) - 8

Simplifying:

3(9) - 6 - 8
27 - 6 - 8
21 - 8
13

Therefore, when x=3, the value of the expression 3x^2 - 2x - 8 is 13.