Question

I am needing to get my last expression on a perfect square v^2-18+?

Answer 1

Any choices? Because +81 would work.

Answer 2

And don't forget to put your v on the middle term. ;) -18v

Answer 3

\(\Large\color{black}{ \bf v^2-18v=0 }\)
\(\Large\color{black}{ \bf v^2-18v+81=0 }\)
\(\Large\color{black}{ \bf (v-9)^2=0 }\)
\(\Large\color{black}{ \bf v=~? }\)