A. because when you face an equality, you need to have a negative and positive answer.
6 7/10 maybe i dont know...................
The answer is the fraction is 66/100 or simplified, 2/3<span />
Take 1/2 of liear coefient, and square it
-18/2=-9, (-9)^2=81
add 81
factors to (y-9)²