Answer
$(v-5)^{2}$
Work Step by Step
$v^{2}-10v+25=$
...write the last term as a square.
$=v^{2}-10v+5^{2}$
...does middle term equal $2ab$?
$10v=2(v)(5)$
$=v^{2}-2(v)(5)+5^{2}$
...write as the square of a binomial.
$=(v-5)^{2}$
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