algebra/trig
posted by Angel .
x^2+2x15=0
solve by completing the square

x^2+2x+1=16+1
(x+1)^2=16
take the sqrt each side
x+1=+4
x=5, 3
posted by Angel .
x^2+2x15=0
solve by completing the square
x^2+2x+1=16+1
(x+1)^2=16
take the sqrt each side
x+1=+4
x=5, 3