X^2+20x+100=36 -subtract 100 and move to other side x^2+20x____=36-100 -divide 20 by 2 which gives you 10. -square 10= (10)^2 which gives you 100. -add the 100 to the right side of the equation. (x+10)^2 = 36-100+100 (x+10)^2=36 -cancel out the square root and square root 36 (x+10)= 6 -subtract 10 x=-4
*Plug in (-4) into the equation to check your work*
