5x^2+10x=13

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Solution for 5x^2+10x=13 equation:


Simplifying
5x2 + 10x = 13

Reorder the terms:
10x + 5x2 = 13

Solving
10x + 5x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + 10x + 5x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 10x + 5x2 = 0

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

Divide each side by '5'.
-2.6 + 2x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + 2x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + 2x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + 2x + x2 = 0 + 2.6
2x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
2x + x2 = 2.6

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 2.6 + 1

Reorder the terms:
1 + 2x + x2 = 2.6 + 1

Combine like terms: 2.6 + 1 = 3.6
1 + 2x + x2 = 3.6

Factor a perfect square on the left side:
(x + 1)(x + 1) = 3.6

Calculate the square root of the right side: 1.897366596

Break this problem into two subproblems by setting 
(x + 1) equal to 1.897366596 and -1.897366596.

Subproblem 1

x + 1 = 1.897366596 Simplifying x + 1 = 1.897366596 Reorder the terms: 1 + x = 1.897366596 Solving 1 + x = 1.897366596 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.897366596 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.897366596 + -1 x = 1.897366596 + -1 Combine like terms: 1.897366596 + -1 = 0.897366596 x = 0.897366596 Simplifying x = 0.897366596

Subproblem 2

x + 1 = -1.897366596 Simplifying x + 1 = -1.897366596 Reorder the terms: 1 + x = -1.897366596 Solving 1 + x = -1.897366596 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.897366596 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.897366596 + -1 x = -1.897366596 + -1 Combine like terms: -1.897366596 + -1 = -2.897366596 x = -2.897366596 Simplifying x = -2.897366596

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.897366596, -2.897366596}

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