-x^2-14x+13=0

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Solution for -x^2-14x+13=0 equation:


Simplifying
-1x2 + -14x + 13 = 0

Reorder the terms:
13 + -14x + -1x2 = 0

Solving
13 + -14x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-13 + 14x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 14x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 14x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 14x + x2 = 0 + 13
14x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
14x + x2 = 13

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 13 + 49

Reorder the terms:
49 + 14x + x2 = 13 + 49

Combine like terms: 13 + 49 = 62
49 + 14x + x2 = 62

Factor a perfect square on the left side:
(x + 7)(x + 7) = 62

Calculate the square root of the right side: 7.874007874

Break this problem into two subproblems by setting 
(x + 7) equal to 7.874007874 and -7.874007874.

Subproblem 1

x + 7 = 7.874007874 Simplifying x + 7 = 7.874007874 Reorder the terms: 7 + x = 7.874007874 Solving 7 + x = 7.874007874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 7.874007874 + -7 Combine like terms: 7 + -7 = 0 0 + x = 7.874007874 + -7 x = 7.874007874 + -7 Combine like terms: 7.874007874 + -7 = 0.874007874 x = 0.874007874 Simplifying x = 0.874007874

Subproblem 2

x + 7 = -7.874007874 Simplifying x + 7 = -7.874007874 Reorder the terms: 7 + x = -7.874007874 Solving 7 + x = -7.874007874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -7.874007874 + -7 Combine like terms: 7 + -7 = 0 0 + x = -7.874007874 + -7 x = -7.874007874 + -7 Combine like terms: -7.874007874 + -7 = -14.874007874 x = -14.874007874 Simplifying x = -14.874007874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.874007874, -14.874007874}

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