(2x+5)x=82

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Solution for (2x+5)x=82 equation:


Simplifying
(2x + 5) * x = 82

Reorder the terms:
(5 + 2x) * x = 82

Reorder the terms for easier multiplication:
x(5 + 2x) = 82
(5 * x + 2x * x) = 82
(5x + 2x2) = 82

Solving
5x + 2x2 = 82

Solving for variable 'x'.

Reorder the terms:
-82 + 5x + 2x2 = 82 + -82

Combine like terms: 82 + -82 = 0
-82 + 5x + 2x2 = 0

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

Divide each side by '2'.
-41 + 2.5x + x2 = 0

Move the constant term to the right:

Add '41' to each side of the equation.
-41 + 2.5x + 41 + x2 = 0 + 41

Reorder the terms:
-41 + 41 + 2.5x + x2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + 2.5x + x2 = 0 + 41
2.5x + x2 = 0 + 41

Combine like terms: 0 + 41 = 41
2.5x + x2 = 41

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 41 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 41 + 1.5625

Combine like terms: 41 + 1.5625 = 42.5625
1.5625 + 2.5x + x2 = 42.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 42.5625

Calculate the square root of the right side: 6.523994175

Break this problem into two subproblems by setting 
(x + 1.25) equal to 6.523994175 and -6.523994175.

Subproblem 1

x + 1.25 = 6.523994175 Simplifying x + 1.25 = 6.523994175 Reorder the terms: 1.25 + x = 6.523994175 Solving 1.25 + x = 6.523994175 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 6.523994175 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 6.523994175 + -1.25 x = 6.523994175 + -1.25 Combine like terms: 6.523994175 + -1.25 = 5.273994175 x = 5.273994175 Simplifying x = 5.273994175

Subproblem 2

x + 1.25 = -6.523994175 Simplifying x + 1.25 = -6.523994175 Reorder the terms: 1.25 + x = -6.523994175 Solving 1.25 + x = -6.523994175 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -6.523994175 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -6.523994175 + -1.25 x = -6.523994175 + -1.25 Combine like terms: -6.523994175 + -1.25 = -7.773994175 x = -7.773994175 Simplifying x = -7.773994175

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.273994175, -7.773994175}

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