(3x-1)(3x+5)=x

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Solution for (3x-1)(3x+5)=x equation:


Simplifying
(3x + -1)(3x + 5) = x

Reorder the terms:
(-1 + 3x)(3x + 5) = x

Reorder the terms:
(-1 + 3x)(5 + 3x) = x

Multiply (-1 + 3x) * (5 + 3x)
(-1(5 + 3x) + 3x * (5 + 3x)) = x
((5 * -1 + 3x * -1) + 3x * (5 + 3x)) = x
((-5 + -3x) + 3x * (5 + 3x)) = x
(-5 + -3x + (5 * 3x + 3x * 3x)) = x
(-5 + -3x + (15x + 9x2)) = x

Combine like terms: -3x + 15x = 12x
(-5 + 12x + 9x2) = x

Solving
-5 + 12x + 9x2 = x

Solving for variable 'x'.

Reorder the terms:
-5 + 12x + -1x + 9x2 = x + -1x

Combine like terms: 12x + -1x = 11x
-5 + 11x + 9x2 = x + -1x

Combine like terms: x + -1x = 0
-5 + 11x + 9x2 = 0

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

Divide each side by '9'.
-0.5555555556 + 1.222222222x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + 1.222222222x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + 1.222222222x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + 1.222222222x + x2 = 0 + 0.5555555556
1.222222222x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
1.222222222x + x2 = 0.5555555556

The x term is 1.222222222x.  Take half its coefficient (0.611111111).
Square it (0.3734567900) and add it to both sides.

Add '0.3734567900' to each side of the equation.
1.222222222x + 0.3734567900 + x2 = 0.5555555556 + 0.3734567900

Reorder the terms:
0.3734567900 + 1.222222222x + x2 = 0.5555555556 + 0.3734567900

Combine like terms: 0.5555555556 + 0.3734567900 = 0.9290123456
0.3734567900 + 1.222222222x + x2 = 0.9290123456

Factor a perfect square on the left side:
(x + 0.611111111)(x + 0.611111111) = 0.9290123456

Calculate the square root of the right side: 0.963852865

Break this problem into two subproblems by setting 
(x + 0.611111111) equal to 0.963852865 and -0.963852865.

Subproblem 1

x + 0.611111111 = 0.963852865 Simplifying x + 0.611111111 = 0.963852865 Reorder the terms: 0.611111111 + x = 0.963852865 Solving 0.611111111 + x = 0.963852865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.611111111' to each side of the equation. 0.611111111 + -0.611111111 + x = 0.963852865 + -0.611111111 Combine like terms: 0.611111111 + -0.611111111 = 0.000000000 0.000000000 + x = 0.963852865 + -0.611111111 x = 0.963852865 + -0.611111111 Combine like terms: 0.963852865 + -0.611111111 = 0.352741754 x = 0.352741754 Simplifying x = 0.352741754

Subproblem 2

x + 0.611111111 = -0.963852865 Simplifying x + 0.611111111 = -0.963852865 Reorder the terms: 0.611111111 + x = -0.963852865 Solving 0.611111111 + x = -0.963852865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.611111111' to each side of the equation. 0.611111111 + -0.611111111 + x = -0.963852865 + -0.611111111 Combine like terms: 0.611111111 + -0.611111111 = 0.000000000 0.000000000 + x = -0.963852865 + -0.611111111 x = -0.963852865 + -0.611111111 Combine like terms: -0.963852865 + -0.611111111 = -1.574963976 x = -1.574963976 Simplifying x = -1.574963976

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.352741754, -1.574963976}

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