5x+x^2+x^2=625

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Solution for 5x+x^2+x^2=625 equation:


Simplifying
5x + x2 + x2 = 625

Combine like terms: x2 + x2 = 2x2
5x + 2x2 = 625

Solving
5x + 2x2 = 625

Solving for variable 'x'.

Reorder the terms:
-625 + 5x + 2x2 = 625 + -625

Combine like terms: 625 + -625 = 0
-625 + 5x + 2x2 = 0

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

Divide each side by '2'.
-312.5 + 2.5x + x2 = 0

Move the constant term to the right:

Add '312.5' to each side of the equation.
-312.5 + 2.5x + 312.5 + x2 = 0 + 312.5

Reorder the terms:
-312.5 + 312.5 + 2.5x + x2 = 0 + 312.5

Combine like terms: -312.5 + 312.5 = 0.0
0.0 + 2.5x + x2 = 0 + 312.5
2.5x + x2 = 0 + 312.5

Combine like terms: 0 + 312.5 = 312.5
2.5x + x2 = 312.5

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 312.5 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 312.5 + 1.5625

Combine like terms: 312.5 + 1.5625 = 314.0625
1.5625 + 2.5x + x2 = 314.0625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 314.0625

Calculate the square root of the right side: 17.721808598

Break this problem into two subproblems by setting 
(x + 1.25) equal to 17.721808598 and -17.721808598.

Subproblem 1

x + 1.25 = 17.721808598 Simplifying x + 1.25 = 17.721808598 Reorder the terms: 1.25 + x = 17.721808598 Solving 1.25 + x = 17.721808598 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 17.721808598 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 17.721808598 + -1.25 x = 17.721808598 + -1.25 Combine like terms: 17.721808598 + -1.25 = 16.471808598 x = 16.471808598 Simplifying x = 16.471808598

Subproblem 2

x + 1.25 = -17.721808598 Simplifying x + 1.25 = -17.721808598 Reorder the terms: 1.25 + x = -17.721808598 Solving 1.25 + x = -17.721808598 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -17.721808598 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -17.721808598 + -1.25 x = -17.721808598 + -1.25 Combine like terms: -17.721808598 + -1.25 = -18.971808598 x = -18.971808598 Simplifying x = -18.971808598

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.471808598, -18.971808598}

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