x^2-14=-15x

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Solution for x^2-14=-15x equation:


Simplifying
x2 + -14 = -15x

Reorder the terms:
-14 + x2 = -15x

Solving
-14 + x2 = -15x

Solving for variable 'x'.

Reorder the terms:
-14 + 15x + x2 = -15x + 15x

Combine like terms: -15x + 15x = 0
-14 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 15x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 15x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 15x + x2 = 0 + 14
15x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
15x + x2 = 14

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 14 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 14 + 56.25

Combine like terms: 14 + 56.25 = 70.25
56.25 + 15x + x2 = 70.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 70.25

Calculate the square root of the right side: 8.381527307

Break this problem into two subproblems by setting 
(x + 7.5) equal to 8.381527307 and -8.381527307.

Subproblem 1

x + 7.5 = 8.381527307 Simplifying x + 7.5 = 8.381527307 Reorder the terms: 7.5 + x = 8.381527307 Solving 7.5 + x = 8.381527307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 8.381527307 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 8.381527307 + -7.5 x = 8.381527307 + -7.5 Combine like terms: 8.381527307 + -7.5 = 0.881527307 x = 0.881527307 Simplifying x = 0.881527307

Subproblem 2

x + 7.5 = -8.381527307 Simplifying x + 7.5 = -8.381527307 Reorder the terms: 7.5 + x = -8.381527307 Solving 7.5 + x = -8.381527307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -8.381527307 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -8.381527307 + -7.5 x = -8.381527307 + -7.5 Combine like terms: -8.381527307 + -7.5 = -15.881527307 x = -15.881527307 Simplifying x = -15.881527307

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.881527307, -15.881527307}

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