10=.006X^2-.02X

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Solution for 10=.006X^2-.02X equation:


Simplifying
10 = 0.006X2 + -0.02X

Reorder the terms:
10 = -0.02X + 0.006X2

Solving
10 = -0.02X + 0.006X2

Solving for variable 'X'.

Reorder the terms:
10 + 0.02X + -0.006X2 = -0.02X + 0.02X + 0.006X2 + -0.006X2

Combine like terms: -0.02X + 0.02X = 0.00
10 + 0.02X + -0.006X2 = 0.00 + 0.006X2 + -0.006X2
10 + 0.02X + -0.006X2 = 0.006X2 + -0.006X2

Combine like terms: 0.006X2 + -0.006X2 = 0.000
10 + 0.02X + -0.006X2 = 0.000

Begin completing the square.  Divide all terms by
-0.006 the coefficient of the squared term: 

Divide each side by '-0.006'.
-1666.666667 + -3.333333333X + X2 = 0

Move the constant term to the right:

Add '1666.666667' to each side of the equation.
-1666.666667 + -3.333333333X + 1666.666667 + X2 = 0 + 1666.666667

Reorder the terms:
-1666.666667 + 1666.666667 + -3.333333333X + X2 = 0 + 1666.666667

Combine like terms: -1666.666667 + 1666.666667 = 0.000000
0.000000 + -3.333333333X + X2 = 0 + 1666.666667
-3.333333333X + X2 = 0 + 1666.666667

Combine like terms: 0 + 1666.666667 = 1666.666667
-3.333333333X + X2 = 1666.666667

The X term is -3.333333333X.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333X + 2.777777779 + X2 = 1666.666667 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333X + X2 = 1666.666667 + 2.777777779

Combine like terms: 1666.666667 + 2.777777779 = 1669.444444779
2.777777779 + -3.333333333X + X2 = 1669.444444779

Factor a perfect square on the left side:
(X + -1.666666667)(X + -1.666666667) = 1669.444444779

Calculate the square root of the right side: 40.858835578

Break this problem into two subproblems by setting 
(X + -1.666666667) equal to 40.858835578 and -40.858835578.

Subproblem 1

X + -1.666666667 = 40.858835578 Simplifying X + -1.666666667 = 40.858835578 Reorder the terms: -1.666666667 + X = 40.858835578 Solving -1.666666667 + X = 40.858835578 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + X = 40.858835578 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + X = 40.858835578 + 1.666666667 X = 40.858835578 + 1.666666667 Combine like terms: 40.858835578 + 1.666666667 = 42.525502245 X = 42.525502245 Simplifying X = 42.525502245

Subproblem 2

X + -1.666666667 = -40.858835578 Simplifying X + -1.666666667 = -40.858835578 Reorder the terms: -1.666666667 + X = -40.858835578 Solving -1.666666667 + X = -40.858835578 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + X = -40.858835578 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + X = -40.858835578 + 1.666666667 X = -40.858835578 + 1.666666667 Combine like terms: -40.858835578 + 1.666666667 = -39.192168911 X = -39.192168911 Simplifying X = -39.192168911

Solution

The solution to the problem is based on the solutions from the subproblems. X = {42.525502245, -39.192168911}

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