4x^2+9x-36=0

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Solution for 4x^2+9x-36=0 equation:


Simplifying
4x2 + 9x + -36 = 0

Reorder the terms:
-36 + 9x + 4x2 = 0

Solving
-36 + 9x + 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 + 2.25x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 2.25x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 2.25x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 2.25x + x2 = 0 + 9
2.25x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
2.25x + x2 = 9

The x term is 2.25x.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25x + 1.265625 + x2 = 9 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 9 + 1.265625

Combine like terms: 9 + 1.265625 = 10.265625
1.265625 + 2.25x + x2 = 10.265625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 10.265625

Calculate the square root of the right side: 3.204001404

Break this problem into two subproblems by setting 
(x + 1.125) equal to 3.204001404 and -3.204001404.

Subproblem 1

x + 1.125 = 3.204001404 Simplifying x + 1.125 = 3.204001404 Reorder the terms: 1.125 + x = 3.204001404 Solving 1.125 + x = 3.204001404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = 3.204001404 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 3.204001404 + -1.125 x = 3.204001404 + -1.125 Combine like terms: 3.204001404 + -1.125 = 2.079001404 x = 2.079001404 Simplifying x = 2.079001404

Subproblem 2

x + 1.125 = -3.204001404 Simplifying x + 1.125 = -3.204001404 Reorder the terms: 1.125 + x = -3.204001404 Solving 1.125 + x = -3.204001404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = -3.204001404 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -3.204001404 + -1.125 x = -3.204001404 + -1.125 Combine like terms: -3.204001404 + -1.125 = -4.329001404 x = -4.329001404 Simplifying x = -4.329001404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.079001404, -4.329001404}

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