x^2+x^2+10x=299

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Solution for x^2+x^2+10x=299 equation:


Simplifying
x2 + x2 + 10x = 299

Reorder the terms:
10x + x2 + x2 = 299

Combine like terms: x2 + x2 = 2x2
10x + 2x2 = 299

Solving
10x + 2x2 = 299

Solving for variable 'x'.

Reorder the terms:
-299 + 10x + 2x2 = 299 + -299

Combine like terms: 299 + -299 = 0
-299 + 10x + 2x2 = 0

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

Divide each side by '2'.
-149.5 + 5x + x2 = 0

Move the constant term to the right:

Add '149.5' to each side of the equation.
-149.5 + 5x + 149.5 + x2 = 0 + 149.5

Reorder the terms:
-149.5 + 149.5 + 5x + x2 = 0 + 149.5

Combine like terms: -149.5 + 149.5 = 0.0
0.0 + 5x + x2 = 0 + 149.5
5x + x2 = 0 + 149.5

Combine like terms: 0 + 149.5 = 149.5
5x + x2 = 149.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 149.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 149.5 + 6.25

Combine like terms: 149.5 + 6.25 = 155.75
6.25 + 5x + x2 = 155.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 155.75

Calculate the square root of the right side: 12.479983974

Break this problem into two subproblems by setting 
(x + 2.5) equal to 12.479983974 and -12.479983974.

Subproblem 1

x + 2.5 = 12.479983974 Simplifying x + 2.5 = 12.479983974 Reorder the terms: 2.5 + x = 12.479983974 Solving 2.5 + x = 12.479983974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 12.479983974 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 12.479983974 + -2.5 x = 12.479983974 + -2.5 Combine like terms: 12.479983974 + -2.5 = 9.979983974 x = 9.979983974 Simplifying x = 9.979983974

Subproblem 2

x + 2.5 = -12.479983974 Simplifying x + 2.5 = -12.479983974 Reorder the terms: 2.5 + x = -12.479983974 Solving 2.5 + x = -12.479983974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -12.479983974 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -12.479983974 + -2.5 x = -12.479983974 + -2.5 Combine like terms: -12.479983974 + -2.5 = -14.979983974 x = -14.979983974 Simplifying x = -14.979983974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.979983974, -14.979983974}

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