x^2+8x+8=2x^2-2x-40

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Solution for x^2+8x+8=2x^2-2x-40 equation:


Simplifying
x2 + 8x + 8 = 2x2 + -2x + -40

Reorder the terms:
8 + 8x + x2 = 2x2 + -2x + -40

Reorder the terms:
8 + 8x + x2 = -40 + -2x + 2x2

Solving
8 + 8x + x2 = -40 + -2x + 2x2

Solving for variable 'x'.

Reorder the terms:
8 + 40 + 8x + 2x + x2 + -2x2 = -40 + -2x + 2x2 + 40 + 2x + -2x2

Combine like terms: 8 + 40 = 48
48 + 8x + 2x + x2 + -2x2 = -40 + -2x + 2x2 + 40 + 2x + -2x2

Combine like terms: 8x + 2x = 10x
48 + 10x + x2 + -2x2 = -40 + -2x + 2x2 + 40 + 2x + -2x2

Combine like terms: x2 + -2x2 = -1x2
48 + 10x + -1x2 = -40 + -2x + 2x2 + 40 + 2x + -2x2

Reorder the terms:
48 + 10x + -1x2 = -40 + 40 + -2x + 2x + 2x2 + -2x2

Combine like terms: -40 + 40 = 0
48 + 10x + -1x2 = 0 + -2x + 2x + 2x2 + -2x2
48 + 10x + -1x2 = -2x + 2x + 2x2 + -2x2

Combine like terms: -2x + 2x = 0
48 + 10x + -1x2 = 0 + 2x2 + -2x2
48 + 10x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
48 + 10x + -1x2 = 0

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

Divide each side by '-1'.
-48 + -10x + x2 = 0

Move the constant term to the right:

Add '48' to each side of the equation.
-48 + -10x + 48 + x2 = 0 + 48

Reorder the terms:
-48 + 48 + -10x + x2 = 0 + 48

Combine like terms: -48 + 48 = 0
0 + -10x + x2 = 0 + 48
-10x + x2 = 0 + 48

Combine like terms: 0 + 48 = 48
-10x + x2 = 48

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 = 48 + 25

Reorder the terms:
25 + -10x + x2 = 48 + 25

Combine like terms: 48 + 25 = 73
25 + -10x + x2 = 73

Factor a perfect square on the left side:
(x + -5)(x + -5) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(x + -5) equal to 8.544003745 and -8.544003745.

Subproblem 1

x + -5 = 8.544003745 Simplifying x + -5 = 8.544003745 Reorder the terms: -5 + x = 8.544003745 Solving -5 + x = 8.544003745 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 = 8.544003745 + 5 Combine like terms: -5 + 5 = 0 0 + x = 8.544003745 + 5 x = 8.544003745 + 5 Combine like terms: 8.544003745 + 5 = 13.544003745 x = 13.544003745 Simplifying x = 13.544003745

Subproblem 2

x + -5 = -8.544003745 Simplifying x + -5 = -8.544003745 Reorder the terms: -5 + x = -8.544003745 Solving -5 + x = -8.544003745 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 = -8.544003745 + 5 Combine like terms: -5 + 5 = 0 0 + x = -8.544003745 + 5 x = -8.544003745 + 5 Combine like terms: -8.544003745 + 5 = -3.544003745 x = -3.544003745 Simplifying x = -3.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.544003745, -3.544003745}

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