0=-x^2+6x+9

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Solution for 0=-x^2+6x+9 equation:


Simplifying
0 = -1x2 + 6x + 9

Reorder the terms:
0 = 9 + 6x + -1x2

Solving
0 = 9 + 6x + -1x2

Solving for variable 'x'.

Combine like terms: 0 + -9 = -9
-9 + -6x + x2 = 9 + 6x + -1x2 + -9 + -6x + x2

Reorder the terms:
-9 + -6x + x2 = 9 + -9 + 6x + -6x + -1x2 + x2

Combine like terms: 9 + -9 = 0
-9 + -6x + x2 = 0 + 6x + -6x + -1x2 + x2
-9 + -6x + x2 = 6x + -6x + -1x2 + x2

Combine like terms: 6x + -6x = 0
-9 + -6x + x2 = 0 + -1x2 + x2
-9 + -6x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-9 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -6x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6x + x2 = 0 + 9
-6x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-6x + x2 = 9

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 = 9 + 9

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

Combine like terms: 9 + 9 = 18
9 + -6x + x2 = 18

Factor a perfect square on the left side:
(x + -3)(x + -3) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + -3) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -3 = 4.242640687 Simplifying x + -3 = 4.242640687 Reorder the terms: -3 + x = 4.242640687 Solving -3 + x = 4.242640687 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 = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.242640687 + 3 x = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 x = 7.242640687 Simplifying x = 7.242640687

Subproblem 2

x + -3 = -4.242640687 Simplifying x + -3 = -4.242640687 Reorder the terms: -3 + x = -4.242640687 Solving -3 + x = -4.242640687 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 = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.242640687 + 3 x = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 x = -1.242640687 Simplifying x = -1.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.242640687, -1.242640687}

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