2x^2-7x-36=0

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Solution for 2x^2-7x-36=0 equation:


Simplifying
2x2 + -7x + -36 = 0

Reorder the terms:
-36 + -7x + 2x2 = 0

Solving
-36 + -7x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-18 + -3.5x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -3.5x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -3.5x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -3.5x + x2 = 0 + 18
-3.5x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-3.5x + x2 = 18

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 18 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 18 + 3.0625

Combine like terms: 18 + 3.0625 = 21.0625
3.0625 + -3.5x + x2 = 21.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 21.0625

Calculate the square root of the right side: 4.589389938

Break this problem into two subproblems by setting 
(x + -1.75) equal to 4.589389938 and -4.589389938.

Subproblem 1

x + -1.75 = 4.589389938 Simplifying x + -1.75 = 4.589389938 Reorder the terms: -1.75 + x = 4.589389938 Solving -1.75 + x = 4.589389938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 4.589389938 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 4.589389938 + 1.75 x = 4.589389938 + 1.75 Combine like terms: 4.589389938 + 1.75 = 6.339389938 x = 6.339389938 Simplifying x = 6.339389938

Subproblem 2

x + -1.75 = -4.589389938 Simplifying x + -1.75 = -4.589389938 Reorder the terms: -1.75 + x = -4.589389938 Solving -1.75 + x = -4.589389938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -4.589389938 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -4.589389938 + 1.75 x = -4.589389938 + 1.75 Combine like terms: -4.589389938 + 1.75 = -2.839389938 x = -2.839389938 Simplifying x = -2.839389938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.339389938, -2.839389938}

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