Question

find the product.
$(9x + 4)^2$
$(9x + 4)^2 = \square$

Explanation:

Step1: Recall square of sum formula

The formula for $(a+b)^2$ is $a^2 + 2ab + b^2$.

Step2: Substitute $a=9x$, $b=4$

First term: $(9x)^2 = 81x^2$
Second term: $2*(9x)*4 = 72x$
Third term: $4^2 = 16$

Step3: Combine all terms

Add the three calculated terms together.

Answer:

$81x^2 + 72x + 16$