36x+4x^2-47=0

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Solution for 36x+4x^2-47=0 equation:


Simplifying
36x + 4x2 + -47 = 0

Reorder the terms:
-47 + 36x + 4x2 = 0

Solving
-47 + 36x + 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'.
-11.75 + 9x + x2 = 0

Move the constant term to the right:

Add '11.75' to each side of the equation.
-11.75 + 9x + 11.75 + x2 = 0 + 11.75

Reorder the terms:
-11.75 + 11.75 + 9x + x2 = 0 + 11.75

Combine like terms: -11.75 + 11.75 = 0.00
0.00 + 9x + x2 = 0 + 11.75
9x + x2 = 0 + 11.75

Combine like terms: 0 + 11.75 = 11.75
9x + x2 = 11.75

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 11.75 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 11.75 + 20.25

Combine like terms: 11.75 + 20.25 = 32
20.25 + 9x + x2 = 32

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + 4.5) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + 4.5 = 5.656854249 Simplifying x + 4.5 = 5.656854249 Reorder the terms: 4.5 + x = 5.656854249 Solving 4.5 + x = 5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 5.656854249 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 5.656854249 + -4.5 x = 5.656854249 + -4.5 Combine like terms: 5.656854249 + -4.5 = 1.156854249 x = 1.156854249 Simplifying x = 1.156854249

Subproblem 2

x + 4.5 = -5.656854249 Simplifying x + 4.5 = -5.656854249 Reorder the terms: 4.5 + x = -5.656854249 Solving 4.5 + x = -5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -5.656854249 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -5.656854249 + -4.5 x = -5.656854249 + -4.5 Combine like terms: -5.656854249 + -4.5 = -10.156854249 x = -10.156854249 Simplifying x = -10.156854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.156854249, -10.156854249}

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