x(9x-5)=40

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Solution for x(9x-5)=40 equation:


Simplifying
x(9x + -5) = 40

Reorder the terms:
x(-5 + 9x) = 40
(-5 * x + 9x * x) = 40
(-5x + 9x2) = 40

Solving
-5x + 9x2 = 40

Solving for variable 'x'.

Reorder the terms:
-40 + -5x + 9x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + -5x + 9x2 = 0

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

Divide each side by '9'.
-4.444444444 + -0.5555555556x + x2 = 0

Move the constant term to the right:

Add '4.444444444' to each side of the equation.
-4.444444444 + -0.5555555556x + 4.444444444 + x2 = 0 + 4.444444444

Reorder the terms:
-4.444444444 + 4.444444444 + -0.5555555556x + x2 = 0 + 4.444444444

Combine like terms: -4.444444444 + 4.444444444 = 0.000000000
0.000000000 + -0.5555555556x + x2 = 0 + 4.444444444
-0.5555555556x + x2 = 0 + 4.444444444

Combine like terms: 0 + 4.444444444 = 4.444444444
-0.5555555556x + x2 = 4.444444444

The x term is -0.5555555556x.  Take half its coefficient (-0.2777777778).
Square it (0.07716049384) and add it to both sides.

Add '0.07716049384' to each side of the equation.
-0.5555555556x + 0.07716049384 + x2 = 4.444444444 + 0.07716049384

Reorder the terms:
0.07716049384 + -0.5555555556x + x2 = 4.444444444 + 0.07716049384

Combine like terms: 4.444444444 + 0.07716049384 = 4.52160493784
0.07716049384 + -0.5555555556x + x2 = 4.52160493784

Factor a perfect square on the left side:
(x + -0.2777777778)(x + -0.2777777778) = 4.52160493784

Calculate the square root of the right side: 2.126406579

Break this problem into two subproblems by setting 
(x + -0.2777777778) equal to 2.126406579 and -2.126406579.

Subproblem 1

x + -0.2777777778 = 2.126406579 Simplifying x + -0.2777777778 = 2.126406579 Reorder the terms: -0.2777777778 + x = 2.126406579 Solving -0.2777777778 + x = 2.126406579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + x = 2.126406579 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + x = 2.126406579 + 0.2777777778 x = 2.126406579 + 0.2777777778 Combine like terms: 2.126406579 + 0.2777777778 = 2.4041843568 x = 2.4041843568 Simplifying x = 2.4041843568

Subproblem 2

x + -0.2777777778 = -2.126406579 Simplifying x + -0.2777777778 = -2.126406579 Reorder the terms: -0.2777777778 + x = -2.126406579 Solving -0.2777777778 + x = -2.126406579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + x = -2.126406579 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + x = -2.126406579 + 0.2777777778 x = -2.126406579 + 0.2777777778 Combine like terms: -2.126406579 + 0.2777777778 = -1.8486288012 x = -1.8486288012 Simplifying x = -1.8486288012

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.4041843568, -1.8486288012}

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