2x^2+5x=36

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Solution for 2x^2+5x=36 equation:


Simplifying
2x2 + 5x = 36

Reorder the terms:
5x + 2x2 = 36

Solving
5x + 2x2 = 36

Solving for variable 'x'.

Reorder the terms:
-36 + 5x + 2x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 5x + 2x2 = 0

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

Divide each side by '2'.
-18 + 2.5x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 2.5x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 2.5x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 2.5x + x2 = 0 + 18
2.5x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
2.5x + x2 = 18

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 = 18 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 18 + 1.5625

Combine like terms: 18 + 1.5625 = 19.5625
1.5625 + 2.5x + x2 = 19.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 19.5625

Calculate the square root of the right side: 4.422951503

Break this problem into two subproblems by setting 
(x + 1.25) equal to 4.422951503 and -4.422951503.

Subproblem 1

x + 1.25 = 4.422951503 Simplifying x + 1.25 = 4.422951503 Reorder the terms: 1.25 + x = 4.422951503 Solving 1.25 + x = 4.422951503 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 = 4.422951503 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 4.422951503 + -1.25 x = 4.422951503 + -1.25 Combine like terms: 4.422951503 + -1.25 = 3.172951503 x = 3.172951503 Simplifying x = 3.172951503

Subproblem 2

x + 1.25 = -4.422951503 Simplifying x + 1.25 = -4.422951503 Reorder the terms: 1.25 + x = -4.422951503 Solving 1.25 + x = -4.422951503 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 = -4.422951503 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -4.422951503 + -1.25 x = -4.422951503 + -1.25 Combine like terms: -4.422951503 + -1.25 = -5.672951503 x = -5.672951503 Simplifying x = -5.672951503

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.172951503, -5.672951503}

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