(x-.5)(x+4)=0

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Solution for (x-.5)(x+4)=0 equation:


Simplifying
(x + -0.5)(x + 4) = 0

Reorder the terms:
(-0.5 + x)(x + 4) = 0

Reorder the terms:
(-0.5 + x)(4 + x) = 0

Multiply (-0.5 + x) * (4 + x)
(-0.5(4 + x) + x(4 + x)) = 0
((4 * -0.5 + x * -0.5) + x(4 + x)) = 0
((-2 + -0.5x) + x(4 + x)) = 0
(-2 + -0.5x + (4 * x + x * x)) = 0
(-2 + -0.5x + (4x + x2)) = 0

Combine like terms: -0.5x + 4x = 3.5x
(-2 + 3.5x + x2) = 0

Solving
-2 + 3.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 3.5x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 3.5x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 3.5x + x2 = 0 + 2
3.5x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
3.5x + x2 = 2

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 2 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 2 + 3.0625

Combine like terms: 2 + 3.0625 = 5.0625
3.0625 + 3.5x + x2 = 5.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 5.0625

Calculate the square root of the right side: 2.25

Break this problem into two subproblems by setting 
(x + 1.75) equal to 2.25 and -2.25.

Subproblem 1

x + 1.75 = 2.25 Simplifying x + 1.75 = 2.25 Reorder the terms: 1.75 + x = 2.25 Solving 1.75 + x = 2.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 2.25 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 2.25 + -1.75 x = 2.25 + -1.75 Combine like terms: 2.25 + -1.75 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + 1.75 = -2.25 Simplifying x + 1.75 = -2.25 Reorder the terms: 1.75 + x = -2.25 Solving 1.75 + x = -2.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -2.25 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -2.25 + -1.75 x = -2.25 + -1.75 Combine like terms: -2.25 + -1.75 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -4}

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