Question

Find the value of 3x³+2x²-4 at x=2​

Answer 1

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

=$\boxed{28}$

Hope this helps!! :)

Please let me know if you have any questions

Answer 2

Answer:

3(2) cube+2(2) square-4

24+8-4=28