2x^2+5x=240

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Solution for 2x^2+5x=240 equation:


Simplifying
2x2 + 5x = 240

Reorder the terms:
5x + 2x2 = 240

Solving
5x + 2x2 = 240

Solving for variable 'x'.

Reorder the terms:
-240 + 5x + 2x2 = 240 + -240

Combine like terms: 240 + -240 = 0
-240 + 5x + 2x2 = 0

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

Divide each side by '2'.
-120 + 2.5x + x2 = 0

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 2.5x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 2.5x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 2.5x + x2 = 0 + 120
2.5x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
2.5x + x2 = 120

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 = 120 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 120 + 1.5625

Combine like terms: 120 + 1.5625 = 121.5625
1.5625 + 2.5x + x2 = 121.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 121.5625

Calculate the square root of the right side: 11.025538536

Break this problem into two subproblems by setting 
(x + 1.25) equal to 11.025538536 and -11.025538536.

Subproblem 1

x + 1.25 = 11.025538536 Simplifying x + 1.25 = 11.025538536 Reorder the terms: 1.25 + x = 11.025538536 Solving 1.25 + x = 11.025538536 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 = 11.025538536 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 11.025538536 + -1.25 x = 11.025538536 + -1.25 Combine like terms: 11.025538536 + -1.25 = 9.775538536 x = 9.775538536 Simplifying x = 9.775538536

Subproblem 2

x + 1.25 = -11.025538536 Simplifying x + 1.25 = -11.025538536 Reorder the terms: 1.25 + x = -11.025538536 Solving 1.25 + x = -11.025538536 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 = -11.025538536 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -11.025538536 + -1.25 x = -11.025538536 + -1.25 Combine like terms: -11.025538536 + -1.25 = -12.275538536 x = -12.275538536 Simplifying x = -12.275538536

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.775538536, -12.275538536}

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