3x^2+135x+85=0

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Solution for 3x^2+135x+85=0 equation:


Simplifying
3x2 + 135x + 85 = 0

Reorder the terms:
85 + 135x + 3x2 = 0

Solving
85 + 135x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
28.33333333 + 45x + x2 = 0

Move the constant term to the right:

Add '-28.33333333' to each side of the equation.
28.33333333 + 45x + -28.33333333 + x2 = 0 + -28.33333333

Reorder the terms:
28.33333333 + -28.33333333 + 45x + x2 = 0 + -28.33333333

Combine like terms: 28.33333333 + -28.33333333 = 0.00000000
0.00000000 + 45x + x2 = 0 + -28.33333333
45x + x2 = 0 + -28.33333333

Combine like terms: 0 + -28.33333333 = -28.33333333
45x + x2 = -28.33333333

The x term is 45x.  Take half its coefficient (22.5).
Square it (506.25) and add it to both sides.

Add '506.25' to each side of the equation.
45x + 506.25 + x2 = -28.33333333 + 506.25

Reorder the terms:
506.25 + 45x + x2 = -28.33333333 + 506.25

Combine like terms: -28.33333333 + 506.25 = 477.91666667
506.25 + 45x + x2 = 477.91666667

Factor a perfect square on the left side:
(x + 22.5)(x + 22.5) = 477.91666667

Calculate the square root of the right side: 21.861305237

Break this problem into two subproblems by setting 
(x + 22.5) equal to 21.861305237 and -21.861305237.

Subproblem 1

x + 22.5 = 21.861305237 Simplifying x + 22.5 = 21.861305237 Reorder the terms: 22.5 + x = 21.861305237 Solving 22.5 + x = 21.861305237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22.5' to each side of the equation. 22.5 + -22.5 + x = 21.861305237 + -22.5 Combine like terms: 22.5 + -22.5 = 0.0 0.0 + x = 21.861305237 + -22.5 x = 21.861305237 + -22.5 Combine like terms: 21.861305237 + -22.5 = -0.638694763 x = -0.638694763 Simplifying x = -0.638694763

Subproblem 2

x + 22.5 = -21.861305237 Simplifying x + 22.5 = -21.861305237 Reorder the terms: 22.5 + x = -21.861305237 Solving 22.5 + x = -21.861305237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22.5' to each side of the equation. 22.5 + -22.5 + x = -21.861305237 + -22.5 Combine like terms: 22.5 + -22.5 = 0.0 0.0 + x = -21.861305237 + -22.5 x = -21.861305237 + -22.5 Combine like terms: -21.861305237 + -22.5 = -44.361305237 x = -44.361305237 Simplifying x = -44.361305237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.638694763, -44.361305237}

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