x^2+x-1=15x

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Solution for x^2+x-1=15x equation:


Simplifying
x2 + x + -1 = 15x

Reorder the terms:
-1 + x + x2 = 15x

Solving
-1 + x + x2 = 15x

Solving for variable 'x'.

Reorder the terms:
-1 + x + -15x + x2 = 15x + -15x

Combine like terms: x + -15x = -14x
-1 + -14x + x2 = 15x + -15x

Combine like terms: 15x + -15x = 0
-1 + -14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -14x + 1 + x2 = 0 + 1

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

Combine like terms: -1 + 1 = 0
0 + -14x + x2 = 0 + 1
-14x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-14x + x2 = 1

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 = 1 + 49

Reorder the terms:
49 + -14x + x2 = 1 + 49

Combine like terms: 1 + 49 = 50
49 + -14x + x2 = 50

Factor a perfect square on the left side:
(x + -7)(x + -7) = 50

Calculate the square root of the right side: 7.071067812

Break this problem into two subproblems by setting 
(x + -7) equal to 7.071067812 and -7.071067812.

Subproblem 1

x + -7 = 7.071067812 Simplifying x + -7 = 7.071067812 Reorder the terms: -7 + x = 7.071067812 Solving -7 + x = 7.071067812 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 = 7.071067812 + 7 Combine like terms: -7 + 7 = 0 0 + x = 7.071067812 + 7 x = 7.071067812 + 7 Combine like terms: 7.071067812 + 7 = 14.071067812 x = 14.071067812 Simplifying x = 14.071067812

Subproblem 2

x + -7 = -7.071067812 Simplifying x + -7 = -7.071067812 Reorder the terms: -7 + x = -7.071067812 Solving -7 + x = -7.071067812 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 = -7.071067812 + 7 Combine like terms: -7 + 7 = 0 0 + x = -7.071067812 + 7 x = -7.071067812 + 7 Combine like terms: -7.071067812 + 7 = -0.071067812 x = -0.071067812 Simplifying x = -0.071067812

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.071067812, -0.071067812}

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