11x+x^2=90

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Solution for 11x+x^2=90 equation:


Simplifying
11x + x2 = 90

Solving
11x + x2 = 90

Solving for variable 'x'.

Reorder the terms:
-90 + 11x + x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 11x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 11x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 11x + x2 = 0 + 90
11x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
11x + x2 = 90

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 90 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 90 + 30.25

Combine like terms: 90 + 30.25 = 120.25
30.25 + 11x + x2 = 120.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 120.25

Calculate the square root of the right side: 10.9658561

Break this problem into two subproblems by setting 
(x + 5.5) equal to 10.9658561 and -10.9658561.

Subproblem 1

x + 5.5 = 10.9658561 Simplifying x + 5.5 = 10.9658561 Reorder the terms: 5.5 + x = 10.9658561 Solving 5.5 + x = 10.9658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 10.9658561 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 10.9658561 + -5.5 x = 10.9658561 + -5.5 Combine like terms: 10.9658561 + -5.5 = 5.4658561 x = 5.4658561 Simplifying x = 5.4658561

Subproblem 2

x + 5.5 = -10.9658561 Simplifying x + 5.5 = -10.9658561 Reorder the terms: 5.5 + x = -10.9658561 Solving 5.5 + x = -10.9658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -10.9658561 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -10.9658561 + -5.5 x = -10.9658561 + -5.5 Combine like terms: -10.9658561 + -5.5 = -16.4658561 x = -16.4658561 Simplifying x = -16.4658561

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.4658561, -16.4658561}

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