4x^2-13x-36=0

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Solution for 4x^2-13x-36=0 equation:


Simplifying
4x2 + -13x + -36 = 0

Reorder the terms:
-36 + -13x + 4x2 = 0

Solving
-36 + -13x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-9 + -3.25x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -3.25x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -3.25x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -3.25x + x2 = 0 + 9
-3.25x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-3.25x + x2 = 9

The x term is -3.25x.  Take half its coefficient (-1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
-3.25x + 2.640625 + x2 = 9 + 2.640625

Reorder the terms:
2.640625 + -3.25x + x2 = 9 + 2.640625

Combine like terms: 9 + 2.640625 = 11.640625
2.640625 + -3.25x + x2 = 11.640625

Factor a perfect square on the left side:
(x + -1.625)(x + -1.625) = 11.640625

Calculate the square root of the right side: 3.411836016

Break this problem into two subproblems by setting 
(x + -1.625) equal to 3.411836016 and -3.411836016.

Subproblem 1

x + -1.625 = 3.411836016 Simplifying x + -1.625 = 3.411836016 Reorder the terms: -1.625 + x = 3.411836016 Solving -1.625 + x = 3.411836016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x = 3.411836016 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x = 3.411836016 + 1.625 x = 3.411836016 + 1.625 Combine like terms: 3.411836016 + 1.625 = 5.036836016 x = 5.036836016 Simplifying x = 5.036836016

Subproblem 2

x + -1.625 = -3.411836016 Simplifying x + -1.625 = -3.411836016 Reorder the terms: -1.625 + x = -3.411836016 Solving -1.625 + x = -3.411836016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x = -3.411836016 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x = -3.411836016 + 1.625 x = -3.411836016 + 1.625 Combine like terms: -3.411836016 + 1.625 = -1.786836016 x = -1.786836016 Simplifying x = -1.786836016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.036836016, -1.786836016}

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