2x+2x(5x-3)=85

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Solution for 2x+2x(5x-3)=85 equation:


Simplifying
2x + 2x(5x + -3) = 85

Reorder the terms:
2x + 2x(-3 + 5x) = 85
2x + (-3 * 2x + 5x * 2x) = 85
2x + (-6x + 10x2) = 85

Combine like terms: 2x + -6x = -4x
-4x + 10x2 = 85

Solving
-4x + 10x2 = 85

Solving for variable 'x'.

Reorder the terms:
-85 + -4x + 10x2 = 85 + -85

Combine like terms: 85 + -85 = 0
-85 + -4x + 10x2 = 0

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

Divide each side by '10'.
-8.5 + -0.4x + x2 = 0.0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + -0.4x + 8.5 + x2 = 0.0 + 8.5

Reorder the terms:
-8.5 + 8.5 + -0.4x + x2 = 0.0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + -0.4x + x2 = 0.0 + 8.5
-0.4x + x2 = 0.0 + 8.5

Combine like terms: 0.0 + 8.5 = 8.5
-0.4x + x2 = 8.5

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 8.5 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 8.5 + 0.04

Combine like terms: 8.5 + 0.04 = 8.54
0.04 + -0.4x + x2 = 8.54

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 8.54

Calculate the square root of the right side: 2.922327839

Break this problem into two subproblems by setting 
(x + -0.2) equal to 2.922327839 and -2.922327839.

Subproblem 1

x + -0.2 = 2.922327839 Simplifying x + -0.2 = 2.922327839 Reorder the terms: -0.2 + x = 2.922327839 Solving -0.2 + x = 2.922327839 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 2.922327839 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 2.922327839 + 0.2 x = 2.922327839 + 0.2 Combine like terms: 2.922327839 + 0.2 = 3.122327839 x = 3.122327839 Simplifying x = 3.122327839

Subproblem 2

x + -0.2 = -2.922327839 Simplifying x + -0.2 = -2.922327839 Reorder the terms: -0.2 + x = -2.922327839 Solving -0.2 + x = -2.922327839 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -2.922327839 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -2.922327839 + 0.2 x = -2.922327839 + 0.2 Combine like terms: -2.922327839 + 0.2 = -2.722327839 x = -2.722327839 Simplifying x = -2.722327839

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.122327839, -2.722327839}

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