90=(x-10)x

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Solution for 90=(x-10)x equation:


Simplifying
90 = (x + -10) * x

Reorder the terms:
90 = (-10 + x) * x

Reorder the terms for easier multiplication:
90 = x(-10 + x)
90 = (-10 * x + x * x)
90 = (-10x + x2)

Solving
90 = -10x + x2

Solving for variable 'x'.

Reorder the terms:
90 + 10x + -1x2 = -10x + 10x + x2 + -1x2

Combine like terms: -10x + 10x = 0
90 + 10x + -1x2 = 0 + x2 + -1x2
90 + 10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
90 + 10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-90 + -10x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + -10x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + -10x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + -10x + x2 = 0 + 90
-10x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
-10x + x2 = 90

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 90 + 25

Reorder the terms:
25 + -10x + x2 = 90 + 25

Combine like terms: 90 + 25 = 115
25 + -10x + x2 = 115

Factor a perfect square on the left side:
(x + -5)(x + -5) = 115

Calculate the square root of the right side: 10.723805295

Break this problem into two subproblems by setting 
(x + -5) equal to 10.723805295 and -10.723805295.

Subproblem 1

x + -5 = 10.723805295 Simplifying x + -5 = 10.723805295 Reorder the terms: -5 + x = 10.723805295 Solving -5 + x = 10.723805295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 10.723805295 + 5 Combine like terms: -5 + 5 = 0 0 + x = 10.723805295 + 5 x = 10.723805295 + 5 Combine like terms: 10.723805295 + 5 = 15.723805295 x = 15.723805295 Simplifying x = 15.723805295

Subproblem 2

x + -5 = -10.723805295 Simplifying x + -5 = -10.723805295 Reorder the terms: -5 + x = -10.723805295 Solving -5 + x = -10.723805295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -10.723805295 + 5 Combine like terms: -5 + 5 = 0 0 + x = -10.723805295 + 5 x = -10.723805295 + 5 Combine like terms: -10.723805295 + 5 = -5.723805295 x = -5.723805295 Simplifying x = -5.723805295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.723805295, -5.723805295}

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