40=x^2-10x

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


Simplifying
40 = x2 + -10x

Reorder the terms:
40 = -10x + x2

Solving
40 = -10x + x2

Solving for variable 'x'.

Reorder the terms:
40 + 10x + -1x2 = -10x + 10x + x2 + -1x2

Combine like terms: -10x + 10x = 0
40 + 10x + -1x2 = 0 + x2 + -1x2
40 + 10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
40 + 10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-40 + -10x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -10x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -10x + x2 = 0 + 40

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

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

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 = 40 + 25

Reorder the terms:
25 + -10x + x2 = 40 + 25

Combine like terms: 40 + 25 = 65
25 + -10x + x2 = 65

Factor a perfect square on the left side:
(x + -5)(x + -5) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(x + -5) equal to 8.062257748 and -8.062257748.

Subproblem 1

x + -5 = 8.062257748 Simplifying x + -5 = 8.062257748 Reorder the terms: -5 + x = 8.062257748 Solving -5 + x = 8.062257748 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 = 8.062257748 + 5 Combine like terms: -5 + 5 = 0 0 + x = 8.062257748 + 5 x = 8.062257748 + 5 Combine like terms: 8.062257748 + 5 = 13.062257748 x = 13.062257748 Simplifying x = 13.062257748

Subproblem 2

x + -5 = -8.062257748 Simplifying x + -5 = -8.062257748 Reorder the terms: -5 + x = -8.062257748 Solving -5 + x = -8.062257748 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 = -8.062257748 + 5 Combine like terms: -5 + 5 = 0 0 + x = -8.062257748 + 5 x = -8.062257748 + 5 Combine like terms: -8.062257748 + 5 = -3.062257748 x = -3.062257748 Simplifying x = -3.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.062257748, -3.062257748}

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