3x(2x-25)-2x=5

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Solution for 3x(2x-25)-2x=5 equation:


Simplifying
3x(2x + -25) + -2x = 5

Reorder the terms:
3x(-25 + 2x) + -2x = 5
(-25 * 3x + 2x * 3x) + -2x = 5
(-75x + 6x2) + -2x = 5

Reorder the terms:
-75x + -2x + 6x2 = 5

Combine like terms: -75x + -2x = -77x
-77x + 6x2 = 5

Solving
-77x + 6x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -77x + 6x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -77x + 6x2 = 0

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

Divide each side by '6'.
-0.8333333333 + -12.83333333x + x2 = 0

Move the constant term to the right:

Add '0.8333333333' to each side of the equation.
-0.8333333333 + -12.83333333x + 0.8333333333 + x2 = 0 + 0.8333333333

Reorder the terms:
-0.8333333333 + 0.8333333333 + -12.83333333x + x2 = 0 + 0.8333333333

Combine like terms: -0.8333333333 + 0.8333333333 = 0.0000000000
0.0000000000 + -12.83333333x + x2 = 0 + 0.8333333333
-12.83333333x + x2 = 0 + 0.8333333333

Combine like terms: 0 + 0.8333333333 = 0.8333333333
-12.83333333x + x2 = 0.8333333333

The x term is -12.83333333x.  Take half its coefficient (-6.416666665).
Square it (41.17361109) and add it to both sides.

Add '41.17361109' to each side of the equation.
-12.83333333x + 41.17361109 + x2 = 0.8333333333 + 41.17361109

Reorder the terms:
41.17361109 + -12.83333333x + x2 = 0.8333333333 + 41.17361109

Combine like terms: 0.8333333333 + 41.17361109 = 42.0069444233
41.17361109 + -12.83333333x + x2 = 42.0069444233

Factor a perfect square on the left side:
(x + -6.416666665)(x + -6.416666665) = 42.0069444233

Calculate the square root of the right side: 6.48127645

Break this problem into two subproblems by setting 
(x + -6.416666665) equal to 6.48127645 and -6.48127645.

Subproblem 1

x + -6.416666665 = 6.48127645 Simplifying x + -6.416666665 = 6.48127645 Reorder the terms: -6.416666665 + x = 6.48127645 Solving -6.416666665 + x = 6.48127645 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.416666665' to each side of the equation. -6.416666665 + 6.416666665 + x = 6.48127645 + 6.416666665 Combine like terms: -6.416666665 + 6.416666665 = 0.000000000 0.000000000 + x = 6.48127645 + 6.416666665 x = 6.48127645 + 6.416666665 Combine like terms: 6.48127645 + 6.416666665 = 12.897943115 x = 12.897943115 Simplifying x = 12.897943115

Subproblem 2

x + -6.416666665 = -6.48127645 Simplifying x + -6.416666665 = -6.48127645 Reorder the terms: -6.416666665 + x = -6.48127645 Solving -6.416666665 + x = -6.48127645 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.416666665' to each side of the equation. -6.416666665 + 6.416666665 + x = -6.48127645 + 6.416666665 Combine like terms: -6.416666665 + 6.416666665 = 0.000000000 0.000000000 + x = -6.48127645 + 6.416666665 x = -6.48127645 + 6.416666665 Combine like terms: -6.48127645 + 6.416666665 = -0.064609785 x = -0.064609785 Simplifying x = -0.064609785

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.897943115, -0.064609785}

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