How Do You Solve X^2 + 3x - 18 = 0 ? A. Solve By Factoring B. Solve Using The Quadratic Formula

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Vin Ginge answered
X2 + 3x - 18 = 0 can be factored (x + 6)(x - 3) =0
This holds true when x + 6 = 0 then x = -6 : Or x - 3 = 0 then x = 3.

Solving using the quadratic formula ; x = {-3 ± √(32 -[4x-18])} ÷ 2 = {-3 ± √(9 + 72)} ÷ 2 = {-3 ± √81} ÷ 2 = {-3 ± 9} ÷ 2
x = (-3 + 9)/2 = 6/2 = 3 ; or x = (-3 -9)/2 = -12/2 = -6

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