Answer
$\color{blue}{16a^2-24ab+9b^2}$
Work Step by Step
RECALL:
$(x-y)^2=x^2-2xy+y^2$
Use the formula above with $x=4a$ and $y=3b$ to obtain:
$=(4a)^2-2(4a)(3b) + (3b)^2
\\=\color{blue}{16a^2-24ab+9b^2}$
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