3(x+25)x=5

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Solution for 3(x+25)x=5 equation:


Simplifying
3(x + 25) * x = 5

Reorder the terms:
3(25 + x) * x = 5

Reorder the terms for easier multiplication:
3x(25 + x) = 5
(25 * 3x + x * 3x) = 5
(75x + 3x2) = 5

Solving
75x + 3x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 75x + 3x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 75x + 3x2 = 0

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

Divide each side by '3'.
-1.666666667 + 25x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + 25x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + 25x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + 25x + x2 = 0 + 1.666666667
25x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
25x + x2 = 1.666666667

The x term is 25x.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25x + 156.25 + x2 = 1.666666667 + 156.25

Reorder the terms:
156.25 + 25x + x2 = 1.666666667 + 156.25

Combine like terms: 1.666666667 + 156.25 = 157.916666667
156.25 + 25x + x2 = 157.916666667

Factor a perfect square on the left side:
(x + 12.5)(x + 12.5) = 157.916666667

Calculate the square root of the right side: 12.566489831

Break this problem into two subproblems by setting 
(x + 12.5) equal to 12.566489831 and -12.566489831.

Subproblem 1

x + 12.5 = 12.566489831 Simplifying x + 12.5 = 12.566489831 Reorder the terms: 12.5 + x = 12.566489831 Solving 12.5 + x = 12.566489831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = 12.566489831 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = 12.566489831 + -12.5 x = 12.566489831 + -12.5 Combine like terms: 12.566489831 + -12.5 = 0.066489831 x = 0.066489831 Simplifying x = 0.066489831

Subproblem 2

x + 12.5 = -12.566489831 Simplifying x + 12.5 = -12.566489831 Reorder the terms: 12.5 + x = -12.566489831 Solving 12.5 + x = -12.566489831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = -12.566489831 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = -12.566489831 + -12.5 x = -12.566489831 + -12.5 Combine like terms: -12.566489831 + -12.5 = -25.066489831 x = -25.066489831 Simplifying x = -25.066489831

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.066489831, -25.066489831}

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