x^2+10x=55

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Solution for x^2+10x=55 equation:


Simplifying
x2 + 10x = 55

Reorder the terms:
10x + x2 = 55

Solving
10x + x2 = 55

Solving for variable 'x'.

Reorder the terms:
-55 + 10x + x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + 10x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + 10x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + 10x + x2 = 0 + 55
10x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
10x + x2 = 55

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 = 55 + 25

Reorder the terms:
25 + 10x + x2 = 55 + 25

Combine like terms: 55 + 25 = 80
25 + 10x + x2 = 80

Factor a perfect square on the left side:
(x + 5)(x + 5) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(x + 5) equal to 8.94427191 and -8.94427191.

Subproblem 1

x + 5 = 8.94427191 Simplifying x + 5 = 8.94427191 Reorder the terms: 5 + x = 8.94427191 Solving 5 + x = 8.94427191 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 = 8.94427191 + -5 Combine like terms: 5 + -5 = 0 0 + x = 8.94427191 + -5 x = 8.94427191 + -5 Combine like terms: 8.94427191 + -5 = 3.94427191 x = 3.94427191 Simplifying x = 3.94427191

Subproblem 2

x + 5 = -8.94427191 Simplifying x + 5 = -8.94427191 Reorder the terms: 5 + x = -8.94427191 Solving 5 + x = -8.94427191 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 = -8.94427191 + -5 Combine like terms: 5 + -5 = 0 0 + x = -8.94427191 + -5 x = -8.94427191 + -5 Combine like terms: -8.94427191 + -5 = -13.94427191 x = -13.94427191 Simplifying x = -13.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.94427191, -13.94427191}

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