(0.5-x)(0.5-x)=4

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Solution for (0.5-x)(0.5-x)=4 equation:


Simplifying
(0.5 + -1x)(0.5 + -1x) = 4

Multiply (0.5 + -1x) * (0.5 + -1x)
(0.5(0.5 + -1x) + -1x * (0.5 + -1x)) = 4
((0.5 * 0.5 + -1x * 0.5) + -1x * (0.5 + -1x)) = 4
((0.25 + -0.5x) + -1x * (0.5 + -1x)) = 4
(0.25 + -0.5x + (0.5 * -1x + -1x * -1x)) = 4
(0.25 + -0.5x + (-0.5x + 1x2)) = 4

Combine like terms: -0.5x + -0.5x = -1x
(0.25 + -1x + 1x2) = 4

Solving
0.25 + -1x + 1x2 = 4

Solving for variable 'x'.

Reorder the terms:
0.25 + -4 + -1x + 1x2 = 4 + -4

Combine like terms: 0.25 + -4 = -3.75
-3.75 + -1x + 1x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-3.75 + -1x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -1x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -1x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -1x + x2 = 0 + 3.75
-1x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-1x + x2 = 3.75

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 3.75 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 3.75 + 0.25

Combine like terms: 3.75 + 0.25 = 4
0.25 + -1x + x2 = 4

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + -0.5) equal to 2 and -2.

Subproblem 1

x + -0.5 = 2 Simplifying x + -0.5 = 2 Reorder the terms: -0.5 + x = 2 Solving -0.5 + x = 2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 2 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 2 + 0.5 x = 2 + 0.5 Combine like terms: 2 + 0.5 = 2.5 x = 2.5 Simplifying x = 2.5

Subproblem 2

x + -0.5 = -2 Simplifying x + -0.5 = -2 Reorder the terms: -0.5 + x = -2 Solving -0.5 + x = -2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -2 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -2 + 0.5 x = -2 + 0.5 Combine like terms: -2 + 0.5 = -1.5 x = -1.5 Simplifying x = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5, -1.5}

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