x^2+10x=90

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Solution for x^2+10x=90 equation:


Simplifying
x2 + 10x = 90

Reorder the terms:
10x + x2 = 90

Solving
10x + x2 = 90

Solving for variable 'x'.

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

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

Begin completing the square.

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 = 5.723805295 x = 5.723805295 Simplifying x = 5.723805295

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 = -15.723805295 x = -15.723805295 Simplifying x = -15.723805295

Solution

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

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