Question

list the values for x after completing the square:

x^2+2x-143=0

Answer 1

x^2+2x+1-1-143=0
(x+1)^2-144=0
(x+1)^2=144
x+1=+-12
x=11, x=-13

Answer 2

(x+1)^2 = 143 +1

x = -1 +- sqrt(144)

x = -1 +- 12; x = -13, x=11