x^2+6x=99

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Solution for x^2+6x=99 equation:


Simplifying
x2 + 6x = 99

Reorder the terms:
6x + x2 = 99

Solving
6x + x2 = 99

Solving for variable 'x'.

Reorder the terms:
-99 + 6x + x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + 6x + 99 + x2 = 0 + 99

Reorder the terms:
-99 + 99 + 6x + x2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + 6x + x2 = 0 + 99
6x + x2 = 0 + 99

Combine like terms: 0 + 99 = 99
6x + x2 = 99

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 = 99 + 9

Reorder the terms:
9 + 6x + x2 = 99 + 9

Combine like terms: 99 + 9 = 108
9 + 6x + x2 = 108

Factor a perfect square on the left side:
(x + 3)(x + 3) = 108

Calculate the square root of the right side: 10.392304845

Break this problem into two subproblems by setting 
(x + 3) equal to 10.392304845 and -10.392304845.

Subproblem 1

x + 3 = 10.392304845 Simplifying x + 3 = 10.392304845 Reorder the terms: 3 + x = 10.392304845 Solving 3 + x = 10.392304845 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 = 10.392304845 + -3 Combine like terms: 3 + -3 = 0 0 + x = 10.392304845 + -3 x = 10.392304845 + -3 Combine like terms: 10.392304845 + -3 = 7.392304845 x = 7.392304845 Simplifying x = 7.392304845

Subproblem 2

x + 3 = -10.392304845 Simplifying x + 3 = -10.392304845 Reorder the terms: 3 + x = -10.392304845 Solving 3 + x = -10.392304845 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 = -10.392304845 + -3 Combine like terms: 3 + -3 = 0 0 + x = -10.392304845 + -3 x = -10.392304845 + -3 Combine like terms: -10.392304845 + -3 = -13.392304845 x = -13.392304845 Simplifying x = -13.392304845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.392304845, -13.392304845}

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