Solve Cubic Equations - Simple Factoring Method

[williambunter]

Thank you PreMath! Algebra is so wonderfully ELEGANT!!

[williambunter]

PreMath. I am so grateful for all your teaching on YouTube. You are providing a wonderful service and showing how wonderfully elegant Mathematics is. I have just turned seventy, and I was never really keen on Maths at school. But now I find it so fascinating, and I am so thankful to have you as my You Tube tutor. God bless you!!!

[rajeshk]

What if it is not common sir ???? Plssss help sir

[pritamdhinsa]

X square ( 5 x + 2) - 4(5 x +2)=0. So ( x square - 4)(5x +2)=0. Hence 5 x + 2 =0. So x= -2/5 and also x square -4= 0. So x square = 4. X = + and - 2. PSD.

[abdelouahabelansari]

please resolve thèse équation
3x^3 +2x^2-10x-8=0

[rlssrlss]

Sir, could you please solve this equation x^3-3x^2-4x-2=0

[ChavoMysterio]

5x^3+2x^2-20x-8=0
x^2(5x+2)-4(5x+2)=0
(x^2-4)(5x+2)=0
(x+2)(x-2)(5x+2)=0

x+2=0
x=-2

x-2=0
x=2

5x+2=0
5x=-2
x=-2/5

Solution Set: {-2, -2/5, 2}