Question

complete the square x^2+2x=3

Answer 1

x = -1
x = 3

Answer 2

Get the coefficient of x which is 2, divide it by 2, then square it, then add it to both sides

x^2 + 2x + 1 = 3 +1

(x+1)^2 = 4 Then taking the square root of both sides

x +1 =2

x = 1

x = -3

Answer 3

(the other root "-3" is obtained because the other square root of 4 is -2)

x + 1 = -2

x = -3