Question 747146
This will help you start:


{{{y= -3x^2 + 30x + 7}}}
{{{y=-3*(x^2-10x)+7}}}
The square term to Complete the Square is {{{(10/2)^2=25}}} or {{{5^2}}}.
{{{y=-3*(x^2-10x+(something))+7-(somethingelse)}}}.
Something is added inside the parentheses and something related to it is subtracted outside the parentheses.


You can finish or try to.