4.2[(8-x)(4-x)]=.25x

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Solution for 4.2[(8-x)(4-x)]=.25x equation:


Simplifying
4.2[(8 + -1x)(4 + -1x)] = 0.25x

Multiply (8 + -1x) * (4 + -1x)
4.2[(8(4 + -1x) + -1x * (4 + -1x))] = 0.25x
4.2[((4 * 8 + -1x * 8) + -1x * (4 + -1x))] = 0.25x
4.2[((32 + -8x) + -1x * (4 + -1x))] = 0.25x
4.2[(32 + -8x + (4 * -1x + -1x * -1x))] = 0.25x
4.2[(32 + -8x + (-4x + 1x2))] = 0.25x

Combine like terms: -8x + -4x = -12x
4.2[(32 + -12x + 1x2)] = 0.25x
[32 * 4.2 + -12x * 4.2 + 1x2 * 4.2] = 0.25x
[134.4 + -50.4x + 4.2x2] = 0.25x

Solving
134.4 + -50.4x + 4.2x2 = 0.25x

Solving for variable 'x'.

Reorder the terms:
134.4 + -50.4x + -0.25x + 4.2x2 = 0.25x + -0.25x

Combine like terms: -50.4x + -0.25x = -50.65x
134.4 + -50.65x + 4.2x2 = 0.25x + -0.25x

Combine like terms: 0.25x + -0.25x = 0.00
134.4 + -50.65x + 4.2x2 = 0.00

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

Divide each side by '4.2'.
32 + -12.05952381x + x2 = 0.0

Move the constant term to the right:

Add '-32' to each side of the equation.
32 + -12.05952381x + -32 + x2 = 0.0 + -32

Reorder the terms:
32 + -32 + -12.05952381x + x2 = 0.0 + -32

Combine like terms: 32 + -32 = 0
0 + -12.05952381x + x2 = 0.0 + -32
-12.05952381x + x2 = 0.0 + -32

Combine like terms: 0.0 + -32 = -32
-12.05952381x + x2 = -32

The x term is -12.05952381x.  Take half its coefficient (-6.029761905).
Square it (36.35802863) and add it to both sides.

Add '36.35802863' to each side of the equation.
-12.05952381x + 36.35802863 + x2 = -32 + 36.35802863

Reorder the terms:
36.35802863 + -12.05952381x + x2 = -32 + 36.35802863

Combine like terms: -32 + 36.35802863 = 4.35802863
36.35802863 + -12.05952381x + x2 = 4.35802863

Factor a perfect square on the left side:
(x + -6.029761905)(x + -6.029761905) = 4.35802863

Calculate the square root of the right side: 2.087589191

Break this problem into two subproblems by setting 
(x + -6.029761905) equal to 2.087589191 and -2.087589191.

Subproblem 1

x + -6.029761905 = 2.087589191 Simplifying x + -6.029761905 = 2.087589191 Reorder the terms: -6.029761905 + x = 2.087589191 Solving -6.029761905 + x = 2.087589191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.029761905' to each side of the equation. -6.029761905 + 6.029761905 + x = 2.087589191 + 6.029761905 Combine like terms: -6.029761905 + 6.029761905 = 0.000000000 0.000000000 + x = 2.087589191 + 6.029761905 x = 2.087589191 + 6.029761905 Combine like terms: 2.087589191 + 6.029761905 = 8.117351096 x = 8.117351096 Simplifying x = 8.117351096

Subproblem 2

x + -6.029761905 = -2.087589191 Simplifying x + -6.029761905 = -2.087589191 Reorder the terms: -6.029761905 + x = -2.087589191 Solving -6.029761905 + x = -2.087589191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.029761905' to each side of the equation. -6.029761905 + 6.029761905 + x = -2.087589191 + 6.029761905 Combine like terms: -6.029761905 + 6.029761905 = 0.000000000 0.000000000 + x = -2.087589191 + 6.029761905 x = -2.087589191 + 6.029761905 Combine like terms: -2.087589191 + 6.029761905 = 3.942172714 x = 3.942172714 Simplifying x = 3.942172714

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.117351096, 3.942172714}

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