x^2-6x-9=4.25

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Solution for x^2-6x-9=4.25 equation:


Simplifying
x2 + -6x + -9 = 4.25

Reorder the terms:
-9 + -6x + x2 = 4.25

Solving
-9 + -6x + x2 = 4.25

Solving for variable 'x'.

Reorder the terms:
-9 + -4.25 + -6x + x2 = 4.25 + -4.25

Combine like terms: -9 + -4.25 = -13.25
-13.25 + -6x + x2 = 4.25 + -4.25

Combine like terms: 4.25 + -4.25 = 0.00
-13.25 + -6x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '13.25' to each side of the equation.
-13.25 + -6x + 13.25 + x2 = 0.00 + 13.25

Reorder the terms:
-13.25 + 13.25 + -6x + x2 = 0.00 + 13.25

Combine like terms: -13.25 + 13.25 = 0.00
0.00 + -6x + x2 = 0.00 + 13.25
-6x + x2 = 0.00 + 13.25

Combine like terms: 0.00 + 13.25 = 13.25
-6x + x2 = 13.25

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 = 13.25 + 9

Reorder the terms:
9 + -6x + x2 = 13.25 + 9

Combine like terms: 13.25 + 9 = 22.25
9 + -6x + x2 = 22.25

Factor a perfect square on the left side:
(x + -3)(x + -3) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(x + -3) equal to 4.716990566 and -4.716990566.

Subproblem 1

x + -3 = 4.716990566 Simplifying x + -3 = 4.716990566 Reorder the terms: -3 + x = 4.716990566 Solving -3 + x = 4.716990566 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 = 4.716990566 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.716990566 + 3 x = 4.716990566 + 3 Combine like terms: 4.716990566 + 3 = 7.716990566 x = 7.716990566 Simplifying x = 7.716990566

Subproblem 2

x + -3 = -4.716990566 Simplifying x + -3 = -4.716990566 Reorder the terms: -3 + x = -4.716990566 Solving -3 + x = -4.716990566 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 = -4.716990566 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.716990566 + 3 x = -4.716990566 + 3 Combine like terms: -4.716990566 + 3 = -1.716990566 x = -1.716990566 Simplifying x = -1.716990566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.716990566, -1.716990566}

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