x^2-9x=9

Simple and best practice solution for x^2-9x=9 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^2-9x=9 equation:


Simplifying
x2 + -9x = 9

Reorder the terms:
-9x + x2 = 9

Solving
-9x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -9x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -9x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -9x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -9x + x2 = 0 + 9
-9x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-9x + x2 = 9

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 9 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 9 + 20.25

Combine like terms: 9 + 20.25 = 29.25
20.25 + -9x + x2 = 29.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(x + -4.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

x + -4.5 = 5.408326913 Simplifying x + -4.5 = 5.408326913 Reorder the terms: -4.5 + x = 5.408326913 Solving -4.5 + x = 5.408326913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 5.408326913 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 5.408326913 + 4.5 x = 5.408326913 + 4.5 Combine like terms: 5.408326913 + 4.5 = 9.908326913 x = 9.908326913 Simplifying x = 9.908326913

Subproblem 2

x + -4.5 = -5.408326913 Simplifying x + -4.5 = -5.408326913 Reorder the terms: -4.5 + x = -5.408326913 Solving -4.5 + x = -5.408326913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -5.408326913 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -5.408326913 + 4.5 x = -5.408326913 + 4.5 Combine like terms: -5.408326913 + 4.5 = -0.908326913 x = -0.908326913 Simplifying x = -0.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.908326913, -0.908326913}

See similar equations:

| 5x^2-4x-12=0 | | 73-4x=14x+5 | | 8b=72 | | 36-3x=6x+19 | | 2g=0.5 | | -38+4Y+9=2(3Y-2)-7 | | x^2-16x+5=0 | | 0.5n=3 | | 28=7w | | 8=4f | | 3e=16-7 | | 13-7x=49-35x | | x^2+16x-2=0 | | 7-7x=139-35x | | 8x-10=2x+14 | | 5y=35 | | 4x+6=-90-8x | | 95-3x=4x+18 | | 12P-17P=35 | | -156-8x=10x+24 | | 2g+4=6 | | 3X-29=5 | | 4x+11=-66-7x | | 0=-4(Y+6) | | 109-4x=4x+5 | | 109-3x=4x+5 | | 4.65x-4.79=13.57-6.84x | | 5w=45 | | 11x^2-9x=0 | | -7-6x=13-10x | | -11y+17=49 | | 70-6x=7x+18 |

Equations solver categories