Answer: 20
Concept:
Here, we need to understand the idea of evaluation.
When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.
Solve:
Given information
x = 2
Given expression
3x³ + 2x² - 4
Substitute values into the expression
3 (2)³ + 2 (2)² - 4
Simplify the exponenets
=3 (8) + 2 (4) - 4)
Simplify by multiplication
=24 + 8 - 4
Simplify by addition/subtraction
=32 - 4
=[tex]\boxed{28}[/tex]
Hope this helps!! :)
Please let me know if you have any questions
