0=4x^2+3x-36

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Solution for 0=4x^2+3x-36 equation:


Simplifying
0 = 4x2 + 3x + -36

Reorder the terms:
0 = -36 + 3x + 4x2

Solving
0 = -36 + 3x + 4x2

Solving for variable 'x'.

Combine like terms: 0 + 36 = 36
36 + -3x + -4x2 = -36 + 3x + 4x2 + 36 + -3x + -4x2

Reorder the terms:
36 + -3x + -4x2 = -36 + 36 + 3x + -3x + 4x2 + -4x2

Combine like terms: -36 + 36 = 0
36 + -3x + -4x2 = 0 + 3x + -3x + 4x2 + -4x2
36 + -3x + -4x2 = 3x + -3x + 4x2 + -4x2

Combine like terms: 3x + -3x = 0
36 + -3x + -4x2 = 0 + 4x2 + -4x2
36 + -3x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
36 + -3x + -4x2 = 0

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

Divide each side by '-4'.
-9 + 0.75x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 0.75x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 0.75x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 0.75x + x2 = 0 + 9
0.75x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
0.75x + x2 = 9

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 9 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 9 + 0.140625

Combine like terms: 9 + 0.140625 = 9.140625
0.140625 + 0.75x + x2 = 9.140625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 9.140625

Calculate the square root of the right side: 3.023346656

Break this problem into two subproblems by setting 
(x + 0.375) equal to 3.023346656 and -3.023346656.

Subproblem 1

x + 0.375 = 3.023346656 Simplifying x + 0.375 = 3.023346656 Reorder the terms: 0.375 + x = 3.023346656 Solving 0.375 + x = 3.023346656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 3.023346656 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 3.023346656 + -0.375 x = 3.023346656 + -0.375 Combine like terms: 3.023346656 + -0.375 = 2.648346656 x = 2.648346656 Simplifying x = 2.648346656

Subproblem 2

x + 0.375 = -3.023346656 Simplifying x + 0.375 = -3.023346656 Reorder the terms: 0.375 + x = -3.023346656 Solving 0.375 + x = -3.023346656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -3.023346656 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -3.023346656 + -0.375 x = -3.023346656 + -0.375 Combine like terms: -3.023346656 + -0.375 = -3.398346656 x = -3.398346656 Simplifying x = -3.398346656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.648346656, -3.398346656}

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