Answer:
(x+1)^2=49
x=6. x=-8
Explanation:
x^2 + 2x - 48 = 0
add 48 to each side
x^2+2x=48
take the coefficient of x
2
divide by 2
2/2=1
Square it
1^2=1
x^2+2x+1=48+1
x^2+2x+1=49
(x+1)^2=49
take the squere root of each side
sqrt((x+1)^2)=+sqrt(49)
x+1=+7
subtract 1 from each side
x+1-1=-1+7
x=-1+7. x=-1-7
x=6. x=-8