Solve Cubic Equations - Quick and Simple Factoring Method

[tomapyne]

Sir I appreciate you for your hard working May Allah continue to elevate Ameen

[pritamdhinsa]

Move. X(x Suare +4x-21)=0.Hence x(x+7)(x-3)=0. X=0. -7and 3. PSD.

[ChavoMysterio]

x^3+4x^2-21x=0
x(x^2+4x-21)=0
x(x+7)(x-3)=0

x=0

x+7=0
x=-7

x-3=0
x=3

Solution Set: {-7, 0, 3}