x^2-9x-63=0

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Solution for x^2-9x-63=0 equation:


Simplifying
x2 + -9x + -63 = 0

Reorder the terms:
-63 + -9x + x2 = 0

Solving
-63 + -9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '63' to each side of the equation.
-63 + -9x + 63 + x2 = 0 + 63

Reorder the terms:
-63 + 63 + -9x + x2 = 0 + 63

Combine like terms: -63 + 63 = 0
0 + -9x + x2 = 0 + 63
-9x + x2 = 0 + 63

Combine like terms: 0 + 63 = 63
-9x + x2 = 63

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 63 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 63 + 20.25

Combine like terms: 63 + 20.25 = 83.25
20.25 + -9x + x2 = 83.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 83.25

Calculate the square root of the right side: 9.124143795

Break this problem into two subproblems by setting 
(x + -4.5) equal to 9.124143795 and -9.124143795.

Subproblem 1

x + -4.5 = 9.124143795 Simplifying x + -4.5 = 9.124143795 Reorder the terms: -4.5 + x = 9.124143795 Solving -4.5 + x = 9.124143795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 9.124143795 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 9.124143795 + 4.5 x = 9.124143795 + 4.5 Combine like terms: 9.124143795 + 4.5 = 13.624143795 x = 13.624143795 Simplifying x = 13.624143795

Subproblem 2

x + -4.5 = -9.124143795 Simplifying x + -4.5 = -9.124143795 Reorder the terms: -4.5 + x = -9.124143795 Solving -4.5 + x = -9.124143795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -9.124143795 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -9.124143795 + 4.5 x = -9.124143795 + 4.5 Combine like terms: -9.124143795 + 4.5 = -4.624143795 x = -4.624143795 Simplifying x = -4.624143795

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.624143795, -4.624143795}

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