Question

Find the value of a3 + 3b2 when a = 2 and b = -2

Answer 1

Given:

a = 2 and b = -2.

To find:

The value of
`a^3+3b^2`.

Solution:

We need to find the value of expression
`a^3+3b^2` at a = 2 and b = -2.

Substituting a = 2 and b=-2 in
`a^3+3b^2`, we get

`(2)^3+3(-2)^2`

`=8+3(4)`

`=8+12`

`=20`

Therefore, the value of expression
`a^3+3b^2` at a = 2 and b = -2 is 20.