x^2-10x-4=40

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Solution for x^2-10x-4=40 equation:


Simplifying
x2 + -10x + -4 = 40

Reorder the terms:
-4 + -10x + x2 = 40

Solving
-4 + -10x + x2 = 40

Solving for variable 'x'.

Reorder the terms:
-4 + -40 + -10x + x2 = 40 + -40

Combine like terms: -4 + -40 = -44
-44 + -10x + x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-44 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + -10x + 44 + x2 = 0 + 44

Reorder the terms:
-44 + 44 + -10x + x2 = 0 + 44

Combine like terms: -44 + 44 = 0
0 + -10x + x2 = 0 + 44
-10x + x2 = 0 + 44

Combine like terms: 0 + 44 = 44
-10x + x2 = 44

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 44 + 25

Reorder the terms:
25 + -10x + x2 = 44 + 25

Combine like terms: 44 + 25 = 69
25 + -10x + x2 = 69

Factor a perfect square on the left side:
(x + -5)(x + -5) = 69

Calculate the square root of the right side: 8.306623863

Break this problem into two subproblems by setting 
(x + -5) equal to 8.306623863 and -8.306623863.

Subproblem 1

x + -5 = 8.306623863 Simplifying x + -5 = 8.306623863 Reorder the terms: -5 + x = 8.306623863 Solving -5 + x = 8.306623863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 8.306623863 + 5 Combine like terms: -5 + 5 = 0 0 + x = 8.306623863 + 5 x = 8.306623863 + 5 Combine like terms: 8.306623863 + 5 = 13.306623863 x = 13.306623863 Simplifying x = 13.306623863

Subproblem 2

x + -5 = -8.306623863 Simplifying x + -5 = -8.306623863 Reorder the terms: -5 + x = -8.306623863 Solving -5 + x = -8.306623863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -8.306623863 + 5 Combine like terms: -5 + 5 = 0 0 + x = -8.306623863 + 5 x = -8.306623863 + 5 Combine like terms: -8.306623863 + 5 = -3.306623863 x = -3.306623863 Simplifying x = -3.306623863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.306623863, -3.306623863}

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