9x^2-18x-64=0

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Solution for 9x^2-18x-64=0 equation:


Simplifying
9x2 + -18x + -64 = 0

Reorder the terms:
-64 + -18x + 9x2 = 0

Solving
-64 + -18x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-7.111111111 + -2x + x2 = 0

Move the constant term to the right:

Add '7.111111111' to each side of the equation.
-7.111111111 + -2x + 7.111111111 + x2 = 0 + 7.111111111

Reorder the terms:
-7.111111111 + 7.111111111 + -2x + x2 = 0 + 7.111111111

Combine like terms: -7.111111111 + 7.111111111 = 0.000000000
0.000000000 + -2x + x2 = 0 + 7.111111111
-2x + x2 = 0 + 7.111111111

Combine like terms: 0 + 7.111111111 = 7.111111111
-2x + x2 = 7.111111111

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 7.111111111 + 1

Reorder the terms:
1 + -2x + x2 = 7.111111111 + 1

Combine like terms: 7.111111111 + 1 = 8.111111111
1 + -2x + x2 = 8.111111111

Factor a perfect square on the left side:
(x + -1)(x + -1) = 8.111111111

Calculate the square root of the right side: 2.848001248

Break this problem into two subproblems by setting 
(x + -1) equal to 2.848001248 and -2.848001248.

Subproblem 1

x + -1 = 2.848001248 Simplifying x + -1 = 2.848001248 Reorder the terms: -1 + x = 2.848001248 Solving -1 + x = 2.848001248 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.848001248 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.848001248 + 1 x = 2.848001248 + 1 Combine like terms: 2.848001248 + 1 = 3.848001248 x = 3.848001248 Simplifying x = 3.848001248

Subproblem 2

x + -1 = -2.848001248 Simplifying x + -1 = -2.848001248 Reorder the terms: -1 + x = -2.848001248 Solving -1 + x = -2.848001248 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.848001248 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.848001248 + 1 x = -2.848001248 + 1 Combine like terms: -2.848001248 + 1 = -1.848001248 x = -1.848001248 Simplifying x = -1.848001248

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.848001248, -1.848001248}

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