x^2-14x=-31

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Solution for x^2-14x=-31 equation:


Simplifying
x2 + -14x = -31

Reorder the terms:
-14x + x2 = -31

Solving
-14x + x2 = -31

Solving for variable 'x'.

Reorder the terms:
31 + -14x + x2 = -31 + 31

Combine like terms: -31 + 31 = 0
31 + -14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-31' to each side of the equation.
31 + -14x + -31 + x2 = 0 + -31

Reorder the terms:
31 + -31 + -14x + x2 = 0 + -31

Combine like terms: 31 + -31 = 0
0 + -14x + x2 = 0 + -31
-14x + x2 = 0 + -31

Combine like terms: 0 + -31 = -31
-14x + x2 = -31

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 = -31 + 49

Reorder the terms:
49 + -14x + x2 = -31 + 49

Combine like terms: -31 + 49 = 18
49 + -14x + x2 = 18

Factor a perfect square on the left side:
(x + -7)(x + -7) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + -7) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -7 = 4.242640687 Simplifying x + -7 = 4.242640687 Reorder the terms: -7 + x = 4.242640687 Solving -7 + x = 4.242640687 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 = 4.242640687 + 7 Combine like terms: -7 + 7 = 0 0 + x = 4.242640687 + 7 x = 4.242640687 + 7 Combine like terms: 4.242640687 + 7 = 11.242640687 x = 11.242640687 Simplifying x = 11.242640687

Subproblem 2

x + -7 = -4.242640687 Simplifying x + -7 = -4.242640687 Reorder the terms: -7 + x = -4.242640687 Solving -7 + x = -4.242640687 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 = -4.242640687 + 7 Combine like terms: -7 + 7 = 0 0 + x = -4.242640687 + 7 x = -4.242640687 + 7 Combine like terms: -4.242640687 + 7 = 2.757359313 x = 2.757359313 Simplifying x = 2.757359313

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.242640687, 2.757359313}

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