x(9x-5)=45

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Solution for x(9x-5)=45 equation:


Simplifying
x(9x + -5) = 45

Reorder the terms:
x(-5 + 9x) = 45
(-5 * x + 9x * x) = 45
(-5x + 9x2) = 45

Solving
-5x + 9x2 = 45

Solving for variable 'x'.

Reorder the terms:
-45 + -5x + 9x2 = 45 + -45

Combine like terms: 45 + -45 = 0
-45 + -5x + 9x2 = 0

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

Divide each side by '9'.
-5 + -0.5555555556x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.5555555556x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.5555555556x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.5555555556x + x2 = 0 + 5
-0.5555555556x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.5555555556x + x2 = 5

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 = 5 + 0.07716049384

Reorder the terms:
0.07716049384 + -0.5555555556x + x2 = 5 + 0.07716049384

Combine like terms: 5 + 0.07716049384 = 5.07716049384
0.07716049384 + -0.5555555556x + x2 = 5.07716049384

Factor a perfect square on the left side:
(x + -0.2777777778)(x + -0.2777777778) = 5.07716049384

Calculate the square root of the right side: 2.253255532

Break this problem into two subproblems by setting 
(x + -0.2777777778) equal to 2.253255532 and -2.253255532.

Subproblem 1

x + -0.2777777778 = 2.253255532 Simplifying x + -0.2777777778 = 2.253255532 Reorder the terms: -0.2777777778 + x = 2.253255532 Solving -0.2777777778 + x = 2.253255532 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 = 2.253255532 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + x = 2.253255532 + 0.2777777778 x = 2.253255532 + 0.2777777778 Combine like terms: 2.253255532 + 0.2777777778 = 2.5310333098 x = 2.5310333098 Simplifying x = 2.5310333098

Subproblem 2

x + -0.2777777778 = -2.253255532 Simplifying x + -0.2777777778 = -2.253255532 Reorder the terms: -0.2777777778 + x = -2.253255532 Solving -0.2777777778 + x = -2.253255532 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 = -2.253255532 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + x = -2.253255532 + 0.2777777778 x = -2.253255532 + 0.2777777778 Combine like terms: -2.253255532 + 0.2777777778 = -1.9754777542 x = -1.9754777542 Simplifying x = -1.9754777542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5310333098, -1.9754777542}

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