x^3-81x=0

Simple and best practice solution for x^3-81x=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 x^3-81x=0 equation:


Simplifying
x3 + -81x = 0

Reorder the terms:
-81x + x3 = 0

Solving
-81x + x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(-81 + x2) = 0

Factor a difference between two squares.
x((9 + x)(-9 + x)) = 0

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 '(9 + x)' equal to zero and attempt to solve: Simplifying 9 + x = 0 Solving 9 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x = 0 + -9 x = 0 + -9 Combine like terms: 0 + -9 = -9 x = -9 Simplifying x = -9

Subproblem 3

Set the factor '(-9 + x)' equal to zero and attempt to solve: Simplifying -9 + x = 0 Solving -9 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + x = 0 + 9 x = 0 + 9 Combine like terms: 0 + 9 = 9 x = 9 Simplifying x = 9

Solution

x = {0, -9, 9}

See similar equations:

| 2x-40=20 | | 7m=35 | | 7x+2=-8+4x+19 | | 15+5(x-3)+8(x-3)=-75-2(x+8)-4(x+8) | | 61=16+y | | 3(x+6)=42 | | 10+x=89 | | -(-3x)*(3+2)+4=3 | | 3.1q-2.7-2.2q=0.1q-2.2 | | 2x-10=14-6x | | 6+12y-3=9y+23-7y | | 5x^2+51x+108=0 | | 9x^4-24x^3+16x^2=0 | | 32-6x=14x | | 135-1y+y+45=180 | | 2(x+3)=42-7x | | x=135-1y | | -2(x-13)-8=2 | | x+45+y=180 | | 90(90-x)=630 | | x^2-50x+625=0 | | (4x+8)4x+-16=3 | | (x+8+187)=4x+3 | | 9x+9=4x+-11 | | 8w+6=5w | | 4x+-16=3 | | 2x+3-4x-7=11 | | 45(x-1)=35x | | -x+5y=5 | | 4x+3=x+8 | | 6x-2y+0=34 | | 30x^2-x-1=0 |

Equations solver categories