Question

If $a=3,b=-3$, find the value of
$a^3-b^3$

Answer 1

Let us substitute $a=3$ and $b=-3$ in the given expression $a^3-b^3$ as shown below:

$a^3-b^3=3^3-(-3{)}^3=27-(-27)=27+27=54$

Hence, $a^3-b^3=54$ when $a=3$ and $b=-3$.