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.