5x[2(x-10)+3]=8

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Solution for 5x[2(x-10)+3]=8 equation:


Simplifying
5x[2(x + -10) + 3] = 8

Reorder the terms:
5x[2(-10 + x) + 3] = 8
5x[(-10 * 2 + x * 2) + 3] = 8
5x[(-20 + 2x) + 3] = 8

Reorder the terms:
5x[-20 + 3 + 2x] = 8

Combine like terms: -20 + 3 = -17
5x[-17 + 2x] = 8
[-17 * 5x + 2x * 5x] = 8
[-85x + 10x2] = 8

Solving
-85x + 10x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + -85x + 10x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + -85x + 10x2 = 0

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

Divide each side by '10'.
-0.8 + -8.5x + x2 = 0.0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -8.5x + 0.8 + x2 = 0.0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -8.5x + x2 = 0.0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -8.5x + x2 = 0.0 + 0.8
-8.5x + x2 = 0.0 + 0.8

Combine like terms: 0.0 + 0.8 = 0.8
-8.5x + x2 = 0.8

The x term is -8.5x.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5x + 18.0625 + x2 = 0.8 + 18.0625

Reorder the terms:
18.0625 + -8.5x + x2 = 0.8 + 18.0625

Combine like terms: 0.8 + 18.0625 = 18.8625
18.0625 + -8.5x + x2 = 18.8625

Factor a perfect square on the left side:
(x + -4.25)(x + -4.25) = 18.8625

Calculate the square root of the right side: 4.343097973

Break this problem into two subproblems by setting 
(x + -4.25) equal to 4.343097973 and -4.343097973.

Subproblem 1

x + -4.25 = 4.343097973 Simplifying x + -4.25 = 4.343097973 Reorder the terms: -4.25 + x = 4.343097973 Solving -4.25 + x = 4.343097973 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = 4.343097973 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = 4.343097973 + 4.25 x = 4.343097973 + 4.25 Combine like terms: 4.343097973 + 4.25 = 8.593097973 x = 8.593097973 Simplifying x = 8.593097973

Subproblem 2

x + -4.25 = -4.343097973 Simplifying x + -4.25 = -4.343097973 Reorder the terms: -4.25 + x = -4.343097973 Solving -4.25 + x = -4.343097973 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = -4.343097973 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = -4.343097973 + 4.25 x = -4.343097973 + 4.25 Combine like terms: -4.343097973 + 4.25 = -0.093097973 x = -0.093097973 Simplifying x = -0.093097973

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.593097973, -0.093097973}

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