5x^2-82x=200

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Solution for 5x^2-82x=200 equation:


Simplifying
5x2 + -82x = 200

Reorder the terms:
-82x + 5x2 = 200

Solving
-82x + 5x2 = 200

Solving for variable 'x'.

Reorder the terms:
-200 + -82x + 5x2 = 200 + -200

Combine like terms: 200 + -200 = 0
-200 + -82x + 5x2 = 0

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

Divide each side by '5'.
-40 + -16.4x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -16.4x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -16.4x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -16.4x + x2 = 0 + 40
-16.4x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-16.4x + x2 = 40

The x term is -16.4x.  Take half its coefficient (-8.2).
Square it (67.24) and add it to both sides.

Add '67.24' to each side of the equation.
-16.4x + 67.24 + x2 = 40 + 67.24

Reorder the terms:
67.24 + -16.4x + x2 = 40 + 67.24

Combine like terms: 40 + 67.24 = 107.24
67.24 + -16.4x + x2 = 107.24

Factor a perfect square on the left side:
(x + -8.2)(x + -8.2) = 107.24

Calculate the square root of the right side: 10.355674773

Break this problem into two subproblems by setting 
(x + -8.2) equal to 10.355674773 and -10.355674773.

Subproblem 1

x + -8.2 = 10.355674773 Simplifying x + -8.2 = 10.355674773 Reorder the terms: -8.2 + x = 10.355674773 Solving -8.2 + x = 10.355674773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.2' to each side of the equation. -8.2 + 8.2 + x = 10.355674773 + 8.2 Combine like terms: -8.2 + 8.2 = 0.0 0.0 + x = 10.355674773 + 8.2 x = 10.355674773 + 8.2 Combine like terms: 10.355674773 + 8.2 = 18.555674773 x = 18.555674773 Simplifying x = 18.555674773

Subproblem 2

x + -8.2 = -10.355674773 Simplifying x + -8.2 = -10.355674773 Reorder the terms: -8.2 + x = -10.355674773 Solving -8.2 + x = -10.355674773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.2' to each side of the equation. -8.2 + 8.2 + x = -10.355674773 + 8.2 Combine like terms: -8.2 + 8.2 = 0.0 0.0 + x = -10.355674773 + 8.2 x = -10.355674773 + 8.2 Combine like terms: -10.355674773 + 8.2 = -2.155674773 x = -2.155674773 Simplifying x = -2.155674773

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.555674773, -2.155674773}

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