5x^2+13x=550

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Solution for 5x^2+13x=550 equation:


Simplifying
5x2 + 13x = 550

Reorder the terms:
13x + 5x2 = 550

Solving
13x + 5x2 = 550

Solving for variable 'x'.

Reorder the terms:
-550 + 13x + 5x2 = 550 + -550

Combine like terms: 550 + -550 = 0
-550 + 13x + 5x2 = 0

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

Divide each side by '5'.
-110 + 2.6x + x2 = 0

Move the constant term to the right:

Add '110' to each side of the equation.
-110 + 2.6x + 110 + x2 = 0 + 110

Reorder the terms:
-110 + 110 + 2.6x + x2 = 0 + 110

Combine like terms: -110 + 110 = 0
0 + 2.6x + x2 = 0 + 110
2.6x + x2 = 0 + 110

Combine like terms: 0 + 110 = 110
2.6x + x2 = 110

The x term is 2.6x.  Take half its coefficient (1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
2.6x + 1.69 + x2 = 110 + 1.69

Reorder the terms:
1.69 + 2.6x + x2 = 110 + 1.69

Combine like terms: 110 + 1.69 = 111.69
1.69 + 2.6x + x2 = 111.69

Factor a perfect square on the left side:
(x + 1.3)(x + 1.3) = 111.69

Calculate the square root of the right side: 10.568348972

Break this problem into two subproblems by setting 
(x + 1.3) equal to 10.568348972 and -10.568348972.

Subproblem 1

x + 1.3 = 10.568348972 Simplifying x + 1.3 = 10.568348972 Reorder the terms: 1.3 + x = 10.568348972 Solving 1.3 + x = 10.568348972 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = 10.568348972 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = 10.568348972 + -1.3 x = 10.568348972 + -1.3 Combine like terms: 10.568348972 + -1.3 = 9.268348972 x = 9.268348972 Simplifying x = 9.268348972

Subproblem 2

x + 1.3 = -10.568348972 Simplifying x + 1.3 = -10.568348972 Reorder the terms: 1.3 + x = -10.568348972 Solving 1.3 + x = -10.568348972 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = -10.568348972 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = -10.568348972 + -1.3 x = -10.568348972 + -1.3 Combine like terms: -10.568348972 + -1.3 = -11.868348972 x = -11.868348972 Simplifying x = -11.868348972

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.268348972, -11.868348972}

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