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

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


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

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

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

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

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

Solving
-5 + 12x + 9x2 = 5x

Solving for variable 'x'.

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

Combine like terms: 12x + -5x = 7x
-5 + 7x + 9x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-5 + 7x + 9x2 = 0

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

Divide each side by '9'.
-0.5555555556 + 0.7777777778x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + 0.7777777778x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + 0.7777777778x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + 0.7777777778x + x2 = 0 + 0.5555555556
0.7777777778x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
0.7777777778x + x2 = 0.5555555556

The x term is 0.7777777778x.  Take half its coefficient (0.3888888889).
Square it (0.1512345679) and add it to both sides.

Add '0.1512345679' to each side of the equation.
0.7777777778x + 0.1512345679 + x2 = 0.5555555556 + 0.1512345679

Reorder the terms:
0.1512345679 + 0.7777777778x + x2 = 0.5555555556 + 0.1512345679

Combine like terms: 0.5555555556 + 0.1512345679 = 0.7067901235
0.1512345679 + 0.7777777778x + x2 = 0.7067901235

Factor a perfect square on the left side:
(x + 0.3888888889)(x + 0.3888888889) = 0.7067901235

Calculate the square root of the right side: 0.840708108

Break this problem into two subproblems by setting 
(x + 0.3888888889) equal to 0.840708108 and -0.840708108.

Subproblem 1

x + 0.3888888889 = 0.840708108 Simplifying x + 0.3888888889 = 0.840708108 Reorder the terms: 0.3888888889 + x = 0.840708108 Solving 0.3888888889 + x = 0.840708108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3888888889' to each side of the equation. 0.3888888889 + -0.3888888889 + x = 0.840708108 + -0.3888888889 Combine like terms: 0.3888888889 + -0.3888888889 = 0.0000000000 0.0000000000 + x = 0.840708108 + -0.3888888889 x = 0.840708108 + -0.3888888889 Combine like terms: 0.840708108 + -0.3888888889 = 0.4518192191 x = 0.4518192191 Simplifying x = 0.4518192191

Subproblem 2

x + 0.3888888889 = -0.840708108 Simplifying x + 0.3888888889 = -0.840708108 Reorder the terms: 0.3888888889 + x = -0.840708108 Solving 0.3888888889 + x = -0.840708108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3888888889' to each side of the equation. 0.3888888889 + -0.3888888889 + x = -0.840708108 + -0.3888888889 Combine like terms: 0.3888888889 + -0.3888888889 = 0.0000000000 0.0000000000 + x = -0.840708108 + -0.3888888889 x = -0.840708108 + -0.3888888889 Combine like terms: -0.840708108 + -0.3888888889 = -1.2295969969 x = -1.2295969969 Simplifying x = -1.2295969969

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4518192191, -1.2295969969}

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