X

This holds true when x + 6 = 0 then x = -6 : Or x - 3 = 0 then x = 3.

Solving using the quadratic formula ; x = {-3 ± √(3

x =

^{2}+ 3x - 18 = 0 can be factored (x + 6)(x - 3) =0This holds true when x + 6 = 0 then x = -6 : Or x - 3 = 0 then x = 3.

Solving using the quadratic formula ; x = {-3 ± √(3

^{2}-[4x-18])} ÷ 2 = {-3 ± √(9 + 72)} ÷ 2 = {-3 ± √81} ÷ 2 = {-3 ± 9} ÷ 2x =

^{(-3 + 9)/}_{2 }=^{6}/_{2}= 3 ; or x =^{(-3 -9)/}_{2}=^{-12}/_{2}= -6