Answer
$25x^2+10x+1$
Work Step by Step
RECALL:
$(a+b)^2=a^2+2ab+b^2$
Using the formula above with $a=5x$ and $b=1$, the given expression is equivalent to:
$=(5x)^2+2(5x)(1)+1^2
\\=25x^2+10x+1$
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