Answer:
(x+3)^2 = 16
Explanation:
x^2+6x = 7
We are trying to complete the square
The first step is to 6ake the coefficient of the x term,
6
and then divide by 2
6/2 =3
Square it
3^2
Add this to each side
x^2 + 6x+9 = 7+9
Then, we have ( x+(6/2)) ^2 is on the left
(x+3)^2 = 16