2(x-1)=x^2-4

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Solution for 2(x-1)=x^2-4 equation:


Simplifying
2(x + -1) = x2 + -4

Reorder the terms:
2(-1 + x) = x2 + -4
(-1 * 2 + x * 2) = x2 + -4
(-2 + 2x) = x2 + -4

Reorder the terms:
-2 + 2x = -4 + x2

Solving
-2 + 2x = -4 + x2

Solving for variable 'x'.

Reorder the terms:
-2 + 4 + 2x + -1x2 = -4 + x2 + 4 + -1x2

Combine like terms: -2 + 4 = 2
2 + 2x + -1x2 = -4 + x2 + 4 + -1x2

Reorder the terms:
2 + 2x + -1x2 = -4 + 4 + x2 + -1x2

Combine like terms: -4 + 4 = 0
2 + 2x + -1x2 = 0 + x2 + -1x2
2 + 2x + -1x2 = x2 + -1x2

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

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

Divide each side by '-1'.
-2 + -2x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -2x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -2x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -2x + x2 = 0 + 2
-2x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-2x + x2 = 2

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 2 + 1

Reorder the terms:
1 + -2x + x2 = 2 + 1

Combine like terms: 2 + 1 = 3
1 + -2x + x2 = 3

Factor a perfect square on the left side:
(x + -1)(x + -1) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(x + -1) equal to 1.732050808 and -1.732050808.

Subproblem 1

x + -1 = 1.732050808 Simplifying x + -1 = 1.732050808 Reorder the terms: -1 + x = 1.732050808 Solving -1 + x = 1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.732050808 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.732050808 + 1 x = 1.732050808 + 1 Combine like terms: 1.732050808 + 1 = 2.732050808 x = 2.732050808 Simplifying x = 2.732050808

Subproblem 2

x + -1 = -1.732050808 Simplifying x + -1 = -1.732050808 Reorder the terms: -1 + x = -1.732050808 Solving -1 + x = -1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.732050808 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.732050808 + 1 x = -1.732050808 + 1 Combine like terms: -1.732050808 + 1 = -0.732050808 x = -0.732050808 Simplifying x = -0.732050808

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.732050808, -0.732050808}

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