8x^2-36x-45=0

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Solution for 8x^2-36x-45=0 equation:


Simplifying
8x2 + -36x + -45 = 0

Reorder the terms:
-45 + -36x + 8x2 = 0

Solving
-45 + -36x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-5.625 + -4.5x + x2 = 0

Move the constant term to the right:

Add '5.625' to each side of the equation.
-5.625 + -4.5x + 5.625 + x2 = 0 + 5.625

Reorder the terms:
-5.625 + 5.625 + -4.5x + x2 = 0 + 5.625

Combine like terms: -5.625 + 5.625 = 0.000
0.000 + -4.5x + x2 = 0 + 5.625
-4.5x + x2 = 0 + 5.625

Combine like terms: 0 + 5.625 = 5.625
-4.5x + x2 = 5.625

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 5.625 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 5.625 + 5.0625

Combine like terms: 5.625 + 5.0625 = 10.6875
5.0625 + -4.5x + x2 = 10.6875

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 10.6875

Calculate the square root of the right side: 3.269174208

Break this problem into two subproblems by setting 
(x + -2.25) equal to 3.269174208 and -3.269174208.

Subproblem 1

x + -2.25 = 3.269174208 Simplifying x + -2.25 = 3.269174208 Reorder the terms: -2.25 + x = 3.269174208 Solving -2.25 + x = 3.269174208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.269174208 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.269174208 + 2.25 x = 3.269174208 + 2.25 Combine like terms: 3.269174208 + 2.25 = 5.519174208 x = 5.519174208 Simplifying x = 5.519174208

Subproblem 2

x + -2.25 = -3.269174208 Simplifying x + -2.25 = -3.269174208 Reorder the terms: -2.25 + x = -3.269174208 Solving -2.25 + x = -3.269174208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.269174208 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.269174208 + 2.25 x = -3.269174208 + 2.25 Combine like terms: -3.269174208 + 2.25 = -1.019174208 x = -1.019174208 Simplifying x = -1.019174208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.519174208, -1.019174208}

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