2x^2+5x=200

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Solution for 2x^2+5x=200 equation:


Simplifying
2x2 + 5x = 200

Reorder the terms:
5x + 2x2 = 200

Solving
5x + 2x2 = 200

Solving for variable 'x'.

Reorder the terms:
-200 + 5x + 2x2 = 200 + -200

Combine like terms: 200 + -200 = 0
-200 + 5x + 2x2 = 0

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

Divide each side by '2'.
-100 + 2.5x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 2.5x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 2.5x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 2.5x + x2 = 0 + 100
2.5x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
2.5x + x2 = 100

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 = 100 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 100 + 1.5625

Combine like terms: 100 + 1.5625 = 101.5625
1.5625 + 2.5x + x2 = 101.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 101.5625

Calculate the square root of the right side: 10.077822185

Break this problem into two subproblems by setting 
(x + 1.25) equal to 10.077822185 and -10.077822185.

Subproblem 1

x + 1.25 = 10.077822185 Simplifying x + 1.25 = 10.077822185 Reorder the terms: 1.25 + x = 10.077822185 Solving 1.25 + x = 10.077822185 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 = 10.077822185 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 10.077822185 + -1.25 x = 10.077822185 + -1.25 Combine like terms: 10.077822185 + -1.25 = 8.827822185 x = 8.827822185 Simplifying x = 8.827822185

Subproblem 2

x + 1.25 = -10.077822185 Simplifying x + 1.25 = -10.077822185 Reorder the terms: 1.25 + x = -10.077822185 Solving 1.25 + x = -10.077822185 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 = -10.077822185 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -10.077822185 + -1.25 x = -10.077822185 + -1.25 Combine like terms: -10.077822185 + -1.25 = -11.327822185 x = -11.327822185 Simplifying x = -11.327822185

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.827822185, -11.327822185}

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