3x^2-30x-100=0

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Solution for 3x^2-30x-100=0 equation:


Simplifying
3x2 + -30x + -100 = 0

Reorder the terms:
-100 + -30x + 3x2 = 0

Solving
-100 + -30x + 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'.
-33.33333333 + -10x + x2 = 0

Move the constant term to the right:

Add '33.33333333' to each side of the equation.
-33.33333333 + -10x + 33.33333333 + x2 = 0 + 33.33333333

Reorder the terms:
-33.33333333 + 33.33333333 + -10x + x2 = 0 + 33.33333333

Combine like terms: -33.33333333 + 33.33333333 = 0.00000000
0.00000000 + -10x + x2 = 0 + 33.33333333
-10x + x2 = 0 + 33.33333333

Combine like terms: 0 + 33.33333333 = 33.33333333
-10x + x2 = 33.33333333

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 33.33333333 + 25

Reorder the terms:
25 + -10x + x2 = 33.33333333 + 25

Combine like terms: 33.33333333 + 25 = 58.33333333
25 + -10x + x2 = 58.33333333

Factor a perfect square on the left side:
(x + -5)(x + -5) = 58.33333333

Calculate the square root of the right side: 7.637626158

Break this problem into two subproblems by setting 
(x + -5) equal to 7.637626158 and -7.637626158.

Subproblem 1

x + -5 = 7.637626158 Simplifying x + -5 = 7.637626158 Reorder the terms: -5 + x = 7.637626158 Solving -5 + x = 7.637626158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 7.637626158 + 5 Combine like terms: -5 + 5 = 0 0 + x = 7.637626158 + 5 x = 7.637626158 + 5 Combine like terms: 7.637626158 + 5 = 12.637626158 x = 12.637626158 Simplifying x = 12.637626158

Subproblem 2

x + -5 = -7.637626158 Simplifying x + -5 = -7.637626158 Reorder the terms: -5 + x = -7.637626158 Solving -5 + x = -7.637626158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -7.637626158 + 5 Combine like terms: -5 + 5 = 0 0 + x = -7.637626158 + 5 x = -7.637626158 + 5 Combine like terms: -7.637626158 + 5 = -2.637626158 x = -2.637626158 Simplifying x = -2.637626158

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.637626158, -2.637626158}

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