5x^2+13x=13

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


Simplifying
5x2 + 13x = 13

Reorder the terms:
13x + 5x2 = 13

Solving
13x + 5x2 = 13

Solving for variable 'x'.

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

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

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

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

Move the constant term to the right:

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

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

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

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

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 = 2.6 + 1.69

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

Combine like terms: 2.6 + 1.69 = 4.29
1.69 + 2.6x + x2 = 4.29

Factor a perfect square on the left side:
(x + 1.3)(x + 1.3) = 4.29

Calculate the square root of the right side: 2.071231518

Break this problem into two subproblems by setting 
(x + 1.3) equal to 2.071231518 and -2.071231518.

Subproblem 1

x + 1.3 = 2.071231518 Simplifying x + 1.3 = 2.071231518 Reorder the terms: 1.3 + x = 2.071231518 Solving 1.3 + x = 2.071231518 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 = 2.071231518 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = 2.071231518 + -1.3 x = 2.071231518 + -1.3 Combine like terms: 2.071231518 + -1.3 = 0.771231518 x = 0.771231518 Simplifying x = 0.771231518

Subproblem 2

x + 1.3 = -2.071231518 Simplifying x + 1.3 = -2.071231518 Reorder the terms: 1.3 + x = -2.071231518 Solving 1.3 + x = -2.071231518 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 = -2.071231518 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = -2.071231518 + -1.3 x = -2.071231518 + -1.3 Combine like terms: -2.071231518 + -1.3 = -3.371231518 x = -3.371231518 Simplifying x = -3.371231518

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.771231518, -3.371231518}

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