x^2-3x-40=x

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Solution for x^2-3x-40=x equation:


Simplifying
x2 + -3x + -40 = x

Reorder the terms:
-40 + -3x + x2 = x

Solving
-40 + -3x + x2 = x

Solving for variable 'x'.

Reorder the terms:
-40 + -3x + -1x + x2 = x + -1x

Combine like terms: -3x + -1x = -4x
-40 + -4x + x2 = x + -1x

Combine like terms: x + -1x = 0
-40 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -4x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -4x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -4x + x2 = 0 + 40
-4x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-4x + x2 = 40

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 40 + 4

Reorder the terms:
4 + -4x + x2 = 40 + 4

Combine like terms: 40 + 4 = 44
4 + -4x + x2 = 44

Factor a perfect square on the left side:
(x + -2)(x + -2) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(x + -2) equal to 6.633249581 and -6.633249581.

Subproblem 1

x + -2 = 6.633249581 Simplifying x + -2 = 6.633249581 Reorder the terms: -2 + x = 6.633249581 Solving -2 + x = 6.633249581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 6.633249581 + 2 Combine like terms: -2 + 2 = 0 0 + x = 6.633249581 + 2 x = 6.633249581 + 2 Combine like terms: 6.633249581 + 2 = 8.633249581 x = 8.633249581 Simplifying x = 8.633249581

Subproblem 2

x + -2 = -6.633249581 Simplifying x + -2 = -6.633249581 Reorder the terms: -2 + x = -6.633249581 Solving -2 + x = -6.633249581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -6.633249581 + 2 Combine like terms: -2 + 2 = 0 0 + x = -6.633249581 + 2 x = -6.633249581 + 2 Combine like terms: -6.633249581 + 2 = -4.633249581 x = -4.633249581 Simplifying x = -4.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.633249581, -4.633249581}

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