x^2+22x=15

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Solution for x^2+22x=15 equation:


Simplifying
x2 + 22x = 15

Reorder the terms:
22x + x2 = 15

Solving
22x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 22x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 22x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 22x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 22x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 22x + x2 = 0 + 15
22x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
22x + x2 = 15

The x term is 22x.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22x + 121 + x2 = 15 + 121

Reorder the terms:
121 + 22x + x2 = 15 + 121

Combine like terms: 15 + 121 = 136
121 + 22x + x2 = 136

Factor a perfect square on the left side:
(x + 11)(x + 11) = 136

Calculate the square root of the right side: 11.66190379

Break this problem into two subproblems by setting 
(x + 11) equal to 11.66190379 and -11.66190379.

Subproblem 1

x + 11 = 11.66190379 Simplifying x + 11 = 11.66190379 Reorder the terms: 11 + x = 11.66190379 Solving 11 + x = 11.66190379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = 11.66190379 + -11 Combine like terms: 11 + -11 = 0 0 + x = 11.66190379 + -11 x = 11.66190379 + -11 Combine like terms: 11.66190379 + -11 = 0.66190379 x = 0.66190379 Simplifying x = 0.66190379

Subproblem 2

x + 11 = -11.66190379 Simplifying x + 11 = -11.66190379 Reorder the terms: 11 + x = -11.66190379 Solving 11 + x = -11.66190379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = -11.66190379 + -11 Combine like terms: 11 + -11 = 0 0 + x = -11.66190379 + -11 x = -11.66190379 + -11 Combine like terms: -11.66190379 + -11 = -22.66190379 x = -22.66190379 Simplifying x = -22.66190379

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.66190379, -22.66190379}

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