Answer
$891$.
Work Step by Step
The given expression is
$=33\cdot 27$
$27$ is $3$ less than $30$, while $33$ is $3$ more than $30$.
Write as product of difference and sum.
$=(30+3)(30-3)$
Use sum and difference pattern $(a+b)(a-b)=a^2-b^2$.
We have $a=30$ and $b=3$.
$=30^2-3^2$
Simplify.
$=900-9$
Hence, the product is $891$.
