5x^2+30x-99=0

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Solution for 5x^2+30x-99=0 equation:


Simplifying
5x2 + 30x + -99 = 0

Reorder the terms:
-99 + 30x + 5x2 = 0

Solving
-99 + 30x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-19.8 + 6x + x2 = 0

Move the constant term to the right:

Add '19.8' to each side of the equation.
-19.8 + 6x + 19.8 + x2 = 0 + 19.8

Reorder the terms:
-19.8 + 19.8 + 6x + x2 = 0 + 19.8

Combine like terms: -19.8 + 19.8 = 0.0
0.0 + 6x + x2 = 0 + 19.8
6x + x2 = 0 + 19.8

Combine like terms: 0 + 19.8 = 19.8
6x + x2 = 19.8

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 19.8 + 9

Reorder the terms:
9 + 6x + x2 = 19.8 + 9

Combine like terms: 19.8 + 9 = 28.8
9 + 6x + x2 = 28.8

Factor a perfect square on the left side:
(x + 3)(x + 3) = 28.8

Calculate the square root of the right side: 5.366563146

Break this problem into two subproblems by setting 
(x + 3) equal to 5.366563146 and -5.366563146.

Subproblem 1

x + 3 = 5.366563146 Simplifying x + 3 = 5.366563146 Reorder the terms: 3 + x = 5.366563146 Solving 3 + x = 5.366563146 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 5.366563146 + -3 Combine like terms: 3 + -3 = 0 0 + x = 5.366563146 + -3 x = 5.366563146 + -3 Combine like terms: 5.366563146 + -3 = 2.366563146 x = 2.366563146 Simplifying x = 2.366563146

Subproblem 2

x + 3 = -5.366563146 Simplifying x + 3 = -5.366563146 Reorder the terms: 3 + x = -5.366563146 Solving 3 + x = -5.366563146 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -5.366563146 + -3 Combine like terms: 3 + -3 = 0 0 + x = -5.366563146 + -3 x = -5.366563146 + -3 Combine like terms: -5.366563146 + -3 = -8.366563146 x = -8.366563146 Simplifying x = -8.366563146

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.366563146, -8.366563146}

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