4x^2=36x+9

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


Simplifying
4x2 = 36x + 9

Reorder the terms:
4x2 = 9 + 36x

Solving
4x2 = 9 + 36x

Solving for variable 'x'.

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

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

Combine like terms: 9 + -9 = 0
-9 + -36x + 4x2 = 0 + 36x + -36x
-9 + -36x + 4x2 = 36x + -36x

Combine like terms: 36x + -36x = 0
-9 + -36x + 4x2 = 0

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

Divide each side by '4'.
-2.25 + -9x + x2 = 0

Move the constant term to the right:

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

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

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -9x + x2 = 0 + 2.25
-9x + x2 = 0 + 2.25

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

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 = 2.25 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 2.25 + 20.25

Combine like terms: 2.25 + 20.25 = 22.5
20.25 + -9x + x2 = 22.5

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 22.5

Calculate the square root of the right side: 4.74341649

Break this problem into two subproblems by setting 
(x + -4.5) equal to 4.74341649 and -4.74341649.

Subproblem 1

x + -4.5 = 4.74341649 Simplifying x + -4.5 = 4.74341649 Reorder the terms: -4.5 + x = 4.74341649 Solving -4.5 + x = 4.74341649 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 = 4.74341649 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 4.74341649 + 4.5 x = 4.74341649 + 4.5 Combine like terms: 4.74341649 + 4.5 = 9.24341649 x = 9.24341649 Simplifying x = 9.24341649

Subproblem 2

x + -4.5 = -4.74341649 Simplifying x + -4.5 = -4.74341649 Reorder the terms: -4.5 + x = -4.74341649 Solving -4.5 + x = -4.74341649 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 = -4.74341649 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -4.74341649 + 4.5 x = -4.74341649 + 4.5 Combine like terms: -4.74341649 + 4.5 = -0.24341649 x = -0.24341649 Simplifying x = -0.24341649

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.24341649, -0.24341649}

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