21x^3+7x^2-28x=0

Simple and best practice solution for 21x^3+7x^2-28x=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 21x^3+7x^2-28x=0 equation:


Simplifying
21x3 + 7x2 + -28x = 0

Reorder the terms:
-28x + 7x2 + 21x3 = 0

Solving
-28x + 7x2 + 21x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '7x'.
7x(-4 + x + 3x2) = 0

Factor a trinomial.
7x((-4 + -3x)(1 + -1x)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(-4 + -3x)' equal to zero and attempt to solve: Simplifying -4 + -3x = 0 Solving -4 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -3x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -3x = 0 + 4 -3x = 0 + 4 Combine like terms: 0 + 4 = 4 -3x = 4 Divide each side by '-3'. x = -1.333333333 Simplifying x = -1.333333333

Subproblem 3

Set the factor '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1

Solution

x = {0, -1.333333333, 1}

See similar equations:

| -2y^2-xy+x^2=0 | | 400/1000 | | 2c+2c+4c=16 | | 2x+18=108-8x | | x^(8/5)=10 | | 9x=48-3x | | 2x+4=40-2x | | 6x+6.59=3x+11 | | 3x=60-3x | | 8x-5y=3x-6 | | f(x)=5x^2-6x+2 | | 9x^2-2y^2=0 | | 5t-2(2t-3)=9t-18 | | [(3/(2x-1)^7] | | 220x^3-24x^2=0 | | 13+22=70 | | 140x^3+60x^2=0 | | v^2-2v-48= | | H(39)=2.59(39)+47.24 | | H(x)=2.59(46)+47.24 | | 2log(5x)+3log(x^4)=3 | | X^2=-qy | | 4x(x+3)-9=10x-8 | | 2xy+6xz=0 | | 5t^2+8t-15=0 | | -7x+2=3x-7 | | -1/2x-4=-6 | | 5k-5=42 | | -7x+0=3x-7 | | 3w-2=2 | | 2c+7=11 | | 5(7x+4)=-125 |

Equations solver categories