Asked by Callie

Whar number must be added to both sides of the equation to solve it by completeing the square? 3x^2+15x=9

(1)225
(2)25
(3)6.25
(4)5
Answered by Reiny
first divide all terms by 3 to get
x^2 + 5x = 3
x^2 + 5x + <b>25/4</b> = 3 + <b>25/4</b>

and I know 25/4 = 6/25
Answered by Reiny
clearly I meant to type
nd I know 25/4 = 6.25