Answer
$(6h-1)^{2}$
Work Step by Step
$36h^{2}-12h+1=$
...write the first term as a square.
$=(6h)^{2}-12h+1^2$
...does middle term equal $2ab$?
$-12h=-2\cdot(6h)\cdot(1)$
yes.
$=(6h)^{2}-2\cdot(6h)\cdot(1)+1$
...write as the square of a binomial.
$=(6h-1)^{2}$
