10-x*x=4*x-8

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Solution for 10-x*x=4*x-8 equation:


Simplifying
10 + -1x * x = 4x + -8

Multiply x * x
10 + -1x2 = 4x + -8

Reorder the terms:
10 + -1x2 = -8 + 4x

Solving
10 + -1x2 = -8 + 4x

Solving for variable 'x'.

Reorder the terms:
10 + 8 + -4x + -1x2 = -8 + 4x + 8 + -4x

Combine like terms: 10 + 8 = 18
18 + -4x + -1x2 = -8 + 4x + 8 + -4x

Reorder the terms:
18 + -4x + -1x2 = -8 + 8 + 4x + -4x

Combine like terms: -8 + 8 = 0
18 + -4x + -1x2 = 0 + 4x + -4x
18 + -4x + -1x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
18 + -4x + -1x2 = 0

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

Divide each side by '-1'.
-18 + 4x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 4x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 4x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 4x + x2 = 0 + 18
4x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
4x + x2 = 18

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 = 18 + 4

Reorder the terms:
4 + 4x + x2 = 18 + 4

Combine like terms: 18 + 4 = 22
4 + 4x + x2 = 22

Factor a perfect square on the left side:
(x + 2)(x + 2) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(x + 2) equal to 4.69041576 and -4.69041576.

Subproblem 1

x + 2 = 4.69041576 Simplifying x + 2 = 4.69041576 Reorder the terms: 2 + x = 4.69041576 Solving 2 + x = 4.69041576 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 = 4.69041576 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.69041576 + -2 x = 4.69041576 + -2 Combine like terms: 4.69041576 + -2 = 2.69041576 x = 2.69041576 Simplifying x = 2.69041576

Subproblem 2

x + 2 = -4.69041576 Simplifying x + 2 = -4.69041576 Reorder the terms: 2 + x = -4.69041576 Solving 2 + x = -4.69041576 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 = -4.69041576 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.69041576 + -2 x = -4.69041576 + -2 Combine like terms: -4.69041576 + -2 = -6.69041576 x = -6.69041576 Simplifying x = -6.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.69041576, -6.69041576}

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