x*x-3x=18

Simple and best practice solution for x*x-3x=18 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*x-3x=18 equation:


Simplifying
x * x + -3x = 18

Multiply x * x
x2 + -3x = 18

Reorder the terms:
-3x + x2 = 18

Solving
-3x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + -3x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -3x + x2 = 0

Factor a trinomial.
(-3 + -1x)(6 + -1x) = 0

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(6 + -1x)' equal to zero and attempt to solve: Simplifying 6 + -1x = 0 Solving 6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1x = 0 + -6 -1x = 0 + -6 Combine like terms: 0 + -6 = -6 -1x = -6 Divide each side by '-1'. x = 6 Simplifying x = 6

Solution

x = {-3, 6}

See similar equations:

| 2-3y=23+4y | | 18p^2-19p-12=0 | | 14.35/0.7 | | 28.9/8.5 | | -2=-3z | | 4x-(3x+4)=2x-44 | | 128n=8 | | 16.56/6.9 | | 9.24/1.1 | | 37.5/2.5 | | (x/6)=9 | | 3x-6=4x+1 | | 50y^3+40y^2+8y=0 | | 6x-90=180 | | 20.4/5.1 | | 9.75/1.3 | | 15.36/4.8 | | 10.5/1.5 | | -1=3Q-5P | | 10.81/2.3 | | 30-n=3(n+6) | | 13x+21=6x+133 | | n^2+-12=0 | | 9p=21 | | 15z^2-9z=0 | | 13x+21=6+133 | | 29.6/3.7 | | 15z-9z=0 | | 8x+1=12x+27 | | n+4=7-2n | | 9.0/0.9 | | x/6-1=-2 |

Equations solver categories