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

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Solution for (4x-0.5)(4+x)=0 equation:


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

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

Multiply (-0.5 + 4x) * (4 + x)
(-0.5(4 + x) + 4x * (4 + x)) = 0
((4 * -0.5 + x * -0.5) + 4x * (4 + x)) = 0
((-2 + -0.5x) + 4x * (4 + x)) = 0
(-2 + -0.5x + (4 * 4x + x * 4x)) = 0
(-2 + -0.5x + (16x + 4x2)) = 0

Combine like terms: -0.5x + 16x = 15.5x
(-2 + 15.5x + 4x2) = 0

Solving
-2 + 15.5x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.5 + 3.875x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 3.875x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 3.875x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 3.875x + x2 = 0 + 0.5
3.875x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
3.875x + x2 = 0.5

The x term is 3.875x.  Take half its coefficient (1.9375).
Square it (3.75390625) and add it to both sides.

Add '3.75390625' to each side of the equation.
3.875x + 3.75390625 + x2 = 0.5 + 3.75390625

Reorder the terms:
3.75390625 + 3.875x + x2 = 0.5 + 3.75390625

Combine like terms: 0.5 + 3.75390625 = 4.25390625
3.75390625 + 3.875x + x2 = 4.25390625

Factor a perfect square on the left side:
(x + 1.9375)(x + 1.9375) = 4.25390625

Calculate the square root of the right side: 2.0625

Break this problem into two subproblems by setting 
(x + 1.9375) equal to 2.0625 and -2.0625.

Subproblem 1

x + 1.9375 = 2.0625 Simplifying x + 1.9375 = 2.0625 Reorder the terms: 1.9375 + x = 2.0625 Solving 1.9375 + x = 2.0625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9375' to each side of the equation. 1.9375 + -1.9375 + x = 2.0625 + -1.9375 Combine like terms: 1.9375 + -1.9375 = 0.0000 0.0000 + x = 2.0625 + -1.9375 x = 2.0625 + -1.9375 Combine like terms: 2.0625 + -1.9375 = 0.125 x = 0.125 Simplifying x = 0.125

Subproblem 2

x + 1.9375 = -2.0625 Simplifying x + 1.9375 = -2.0625 Reorder the terms: 1.9375 + x = -2.0625 Solving 1.9375 + x = -2.0625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9375' to each side of the equation. 1.9375 + -1.9375 + x = -2.0625 + -1.9375 Combine like terms: 1.9375 + -1.9375 = 0.0000 0.0000 + x = -2.0625 + -1.9375 x = -2.0625 + -1.9375 Combine like terms: -2.0625 + -1.9375 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.125, -4}

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