Solve the quadratic equation x2 + 2x – 20 = 0 by completing the square.

x^2 + 2x - 20 = 0

x^2 + 2x - 20 + 20 = 0 + 20  ( add 20 to both sides)

x^2 + 2x = 20

x^2 + 2x + 1^2 = 20 + 1^2 ( add 1^2 to both sides)

( x + 1 )^2 = 21

x =

x =

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

its c or d   take a lucky guess my dude