0.005x^2-0.02x-9.66=0

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Solution for 0.005x^2-0.02x-9.66=0 equation:


Simplifying
0.005x2 + -0.02x + -9.66 = 0

Reorder the terms:
-9.66 + -0.02x + 0.005x2 = 0

Solving
-9.66 + -0.02x + 0.005x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.005'.
-1932 + -4x + x2 = 0

Move the constant term to the right:

Add '1932' to each side of the equation.
-1932 + -4x + 1932 + x2 = 0 + 1932

Reorder the terms:
-1932 + 1932 + -4x + x2 = 0 + 1932

Combine like terms: -1932 + 1932 = 0
0 + -4x + x2 = 0 + 1932
-4x + x2 = 0 + 1932

Combine like terms: 0 + 1932 = 1932
-4x + x2 = 1932

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 1932 + 4

Reorder the terms:
4 + -4x + x2 = 1932 + 4

Combine like terms: 1932 + 4 = 1936
4 + -4x + x2 = 1936

Factor a perfect square on the left side:
(x + -2)(x + -2) = 1936

Calculate the square root of the right side: 44

Break this problem into two subproblems by setting 
(x + -2) equal to 44 and -44.

Subproblem 1

x + -2 = 44 Simplifying x + -2 = 44 Reorder the terms: -2 + x = 44 Solving -2 + x = 44 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 44 + 2 Combine like terms: -2 + 2 = 0 0 + x = 44 + 2 x = 44 + 2 Combine like terms: 44 + 2 = 46 x = 46 Simplifying x = 46

Subproblem 2

x + -2 = -44 Simplifying x + -2 = -44 Reorder the terms: -2 + x = -44 Solving -2 + x = -44 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -44 + 2 Combine like terms: -2 + 2 = 0 0 + x = -44 + 2 x = -44 + 2 Combine like terms: -44 + 2 = -42 x = -42 Simplifying x = -42

Solution

The solution to the problem is based on the solutions from the subproblems. x = {46, -42}

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