(5+x)2x=85

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


Simplifying
(5 + x) * 2x = 85

Reorder the terms for easier multiplication:
2x(5 + x) = 85
(5 * 2x + x * 2x) = 85
(10x + 2x2) = 85

Solving
10x + 2x2 = 85

Solving for variable 'x'.

Reorder the terms:
-85 + 10x + 2x2 = 85 + -85

Combine like terms: 85 + -85 = 0
-85 + 10x + 2x2 = 0

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

Divide each side by '2'.
-42.5 + 5x + x2 = 0

Move the constant term to the right:

Add '42.5' to each side of the equation.
-42.5 + 5x + 42.5 + x2 = 0 + 42.5

Reorder the terms:
-42.5 + 42.5 + 5x + x2 = 0 + 42.5

Combine like terms: -42.5 + 42.5 = 0.0
0.0 + 5x + x2 = 0 + 42.5
5x + x2 = 0 + 42.5

Combine like terms: 0 + 42.5 = 42.5
5x + x2 = 42.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 42.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 42.5 + 6.25

Combine like terms: 42.5 + 6.25 = 48.75
6.25 + 5x + x2 = 48.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 48.75

Calculate the square root of the right side: 6.982120022

Break this problem into two subproblems by setting 
(x + 2.5) equal to 6.982120022 and -6.982120022.

Subproblem 1

x + 2.5 = 6.982120022 Simplifying x + 2.5 = 6.982120022 Reorder the terms: 2.5 + x = 6.982120022 Solving 2.5 + x = 6.982120022 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 6.982120022 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 6.982120022 + -2.5 x = 6.982120022 + -2.5 Combine like terms: 6.982120022 + -2.5 = 4.482120022 x = 4.482120022 Simplifying x = 4.482120022

Subproblem 2

x + 2.5 = -6.982120022 Simplifying x + 2.5 = -6.982120022 Reorder the terms: 2.5 + x = -6.982120022 Solving 2.5 + x = -6.982120022 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -6.982120022 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -6.982120022 + -2.5 x = -6.982120022 + -2.5 Combine like terms: -6.982120022 + -2.5 = -9.482120022 x = -9.482120022 Simplifying x = -9.482120022

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.482120022, -9.482120022}

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