.0064x^2-.64x+12=0

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Solution for .0064x^2-.64x+12=0 equation:


Simplifying
0.0064x2 + -0.64x + 12 = 0

Reorder the terms:
12 + -0.64x + 0.0064x2 = 0

Solving
12 + -0.64x + 0.0064x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
0.0064 the coefficient of the squared term: 

Divide each side by '0.0064'.
1875 + -100x + x2 = 0

Move the constant term to the right:

Add '-1875' to each side of the equation.
1875 + -100x + -1875 + x2 = 0 + -1875

Reorder the terms:
1875 + -1875 + -100x + x2 = 0 + -1875

Combine like terms: 1875 + -1875 = 0
0 + -100x + x2 = 0 + -1875
-100x + x2 = 0 + -1875

Combine like terms: 0 + -1875 = -1875
-100x + x2 = -1875

The x term is -100x.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x + 2500 + x2 = -1875 + 2500

Reorder the terms:
2500 + -100x + x2 = -1875 + 2500

Combine like terms: -1875 + 2500 = 625
2500 + -100x + x2 = 625

Factor a perfect square on the left side:
(x + -50)(x + -50) = 625

Calculate the square root of the right side: 25

Break this problem into two subproblems by setting 
(x + -50) equal to 25 and -25.

Subproblem 1

x + -50 = 25 Simplifying x + -50 = 25 Reorder the terms: -50 + x = 25 Solving -50 + x = 25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = 25 + 50 Combine like terms: -50 + 50 = 0 0 + x = 25 + 50 x = 25 + 50 Combine like terms: 25 + 50 = 75 x = 75 Simplifying x = 75

Subproblem 2

x + -50 = -25 Simplifying x + -50 = -25 Reorder the terms: -50 + x = -25 Solving -50 + x = -25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = -25 + 50 Combine like terms: -50 + 50 = 0 0 + x = -25 + 50 x = -25 + 50 Combine like terms: -25 + 50 = 25 x = 25 Simplifying x = 25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {75, 25}

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