.3x-.01=-.64x^2

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Solution for .3x-.01=-.64x^2 equation:


Simplifying
0.3x + -0.01 = -0.64x2

Reorder the terms:
-0.01 + 0.3x = -0.64x2

Solving
-0.01 + 0.3x = -0.64x2

Solving for variable 'x'.

Combine like terms: -0.64x2 + 0.64x2 = 0.00
-0.01 + 0.3x + 0.64x2 = 0.00

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

Divide each side by '0.64'.
-0.015625 + 0.46875x + x2 = 0

Move the constant term to the right:

Add '0.015625' to each side of the equation.
-0.015625 + 0.46875x + 0.015625 + x2 = 0 + 0.015625

Reorder the terms:
-0.015625 + 0.015625 + 0.46875x + x2 = 0 + 0.015625

Combine like terms: -0.015625 + 0.015625 = 0.000000
0.000000 + 0.46875x + x2 = 0 + 0.015625
0.46875x + x2 = 0 + 0.015625

Combine like terms: 0 + 0.015625 = 0.015625
0.46875x + x2 = 0.015625

The x term is 0.46875x.  Take half its coefficient (0.234375).
Square it (0.05493164063) and add it to both sides.

Add '0.05493164063' to each side of the equation.
0.46875x + 0.05493164063 + x2 = 0.015625 + 0.05493164063

Reorder the terms:
0.05493164063 + 0.46875x + x2 = 0.015625 + 0.05493164063

Combine like terms: 0.015625 + 0.05493164063 = 0.07055664063
0.05493164063 + 0.46875x + x2 = 0.07055664063

Factor a perfect square on the left side:
(x + 0.234375)(x + 0.234375) = 0.07055664063

Calculate the square root of the right side: 0.265625

Break this problem into two subproblems by setting 
(x + 0.234375) equal to 0.265625 and -0.265625.

Subproblem 1

x + 0.234375 = 0.265625 Simplifying x + 0.234375 = 0.265625 Reorder the terms: 0.234375 + x = 0.265625 Solving 0.234375 + x = 0.265625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.234375' to each side of the equation. 0.234375 + -0.234375 + x = 0.265625 + -0.234375 Combine like terms: 0.234375 + -0.234375 = 0.000000 0.000000 + x = 0.265625 + -0.234375 x = 0.265625 + -0.234375 Combine like terms: 0.265625 + -0.234375 = 0.03125 x = 0.03125 Simplifying x = 0.03125

Subproblem 2

x + 0.234375 = -0.265625 Simplifying x + 0.234375 = -0.265625 Reorder the terms: 0.234375 + x = -0.265625 Solving 0.234375 + x = -0.265625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.234375' to each side of the equation. 0.234375 + -0.234375 + x = -0.265625 + -0.234375 Combine like terms: 0.234375 + -0.234375 = 0.000000 0.000000 + x = -0.265625 + -0.234375 x = -0.265625 + -0.234375 Combine like terms: -0.265625 + -0.234375 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.03125, -0.5}

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