Final answer to the problem
$4a^{2}x^{2}+36ax+81$
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Step-by-step Solution
Specify the solving method
1
Expand the expression $\left(2ax+9\right)^2$ using the square of a binomial: $(a+b)^2=a^2+2ab+b^2$
$4a^{2}x^{2}+36ax+81$
Final answer to the problem
$4a^{2}x^{2}+36ax+81$