2X^2-8X-8=X-4

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Solution for 2X^2-8X-8=X-4 equation:


Simplifying
2X2 + -8X + -8 = X + -4

Reorder the terms:
-8 + -8X + 2X2 = X + -4

Reorder the terms:
-8 + -8X + 2X2 = -4 + X

Solving
-8 + -8X + 2X2 = -4 + X

Solving for variable 'X'.

Reorder the terms:
-8 + 4 + -8X + -1X + 2X2 = -4 + X + 4 + -1X

Combine like terms: -8 + 4 = -4
-4 + -8X + -1X + 2X2 = -4 + X + 4 + -1X

Combine like terms: -8X + -1X = -9X
-4 + -9X + 2X2 = -4 + X + 4 + -1X

Reorder the terms:
-4 + -9X + 2X2 = -4 + 4 + X + -1X

Combine like terms: -4 + 4 = 0
-4 + -9X + 2X2 = 0 + X + -1X
-4 + -9X + 2X2 = X + -1X

Combine like terms: X + -1X = 0
-4 + -9X + 2X2 = 0

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

Divide each side by '2'.
-2 + -4.5X + X2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -4.5X + 2 + X2 = 0 + 2

Reorder the terms:
-2 + 2 + -4.5X + X2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -4.5X + X2 = 0 + 2
-4.5X + X2 = 0 + 2

Combine like terms: 0 + 2 = 2
-4.5X + X2 = 2

The X term is -4.5X.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5X + 5.0625 + X2 = 2 + 5.0625

Reorder the terms:
5.0625 + -4.5X + X2 = 2 + 5.0625

Combine like terms: 2 + 5.0625 = 7.0625
5.0625 + -4.5X + X2 = 7.0625

Factor a perfect square on the left side:
(X + -2.25)(X + -2.25) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(X + -2.25) equal to 2.657536453 and -2.657536453.

Subproblem 1

X + -2.25 = 2.657536453 Simplifying X + -2.25 = 2.657536453 Reorder the terms: -2.25 + X = 2.657536453 Solving -2.25 + X = 2.657536453 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + X = 2.657536453 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + X = 2.657536453 + 2.25 X = 2.657536453 + 2.25 Combine like terms: 2.657536453 + 2.25 = 4.907536453 X = 4.907536453 Simplifying X = 4.907536453

Subproblem 2

X + -2.25 = -2.657536453 Simplifying X + -2.25 = -2.657536453 Reorder the terms: -2.25 + X = -2.657536453 Solving -2.25 + X = -2.657536453 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + X = -2.657536453 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + X = -2.657536453 + 2.25 X = -2.657536453 + 2.25 Combine like terms: -2.657536453 + 2.25 = -0.407536453 X = -0.407536453 Simplifying X = -0.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. X = {4.907536453, -0.407536453}

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