Answer
$25b^{2}-40b+16$
Work Step by Step
$(5b-4)^{2}$
Appy the formula for squaring a binomial, which is $(a-b)^{2}=a^{2}-2ab+b^{2}$
Here, $a=5b$ and $b=4$
$(5b-4)^{2}=(5b)^{2}-2(5b)(4)+4^{2}=25b^{2}-40b+16$
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