.08r-.04=-.32r^2

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Solution for .08r-.04=-.32r^2 equation:


Simplifying
0.08r + -0.04 = -0.32r2

Reorder the terms:
-0.04 + 0.08r = -0.32r2

Solving
-0.04 + 0.08r = -0.32r2

Solving for variable 'r'.

Combine like terms: -0.32r2 + 0.32r2 = 0.00
-0.04 + 0.08r + 0.32r2 = 0.00

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

Divide each side by '0.32'.
-0.125 + 0.25r + r2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + 0.25r + 0.125 + r2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + 0.25r + r2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + 0.25r + r2 = 0 + 0.125
0.25r + r2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
0.25r + r2 = 0.125

The r term is 0.25r.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25r + 0.015625 + r2 = 0.125 + 0.015625

Reorder the terms:
0.015625 + 0.25r + r2 = 0.125 + 0.015625

Combine like terms: 0.125 + 0.015625 = 0.140625
0.015625 + 0.25r + r2 = 0.140625

Factor a perfect square on the left side:
(r + 0.125)(r + 0.125) = 0.140625

Calculate the square root of the right side: 0.375

Break this problem into two subproblems by setting 
(r + 0.125) equal to 0.375 and -0.375.

Subproblem 1

r + 0.125 = 0.375 Simplifying r + 0.125 = 0.375 Reorder the terms: 0.125 + r = 0.375 Solving 0.125 + r = 0.375 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + r = 0.375 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + r = 0.375 + -0.125 r = 0.375 + -0.125 Combine like terms: 0.375 + -0.125 = 0.25 r = 0.25 Simplifying r = 0.25

Subproblem 2

r + 0.125 = -0.375 Simplifying r + 0.125 = -0.375 Reorder the terms: 0.125 + r = -0.375 Solving 0.125 + r = -0.375 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + r = -0.375 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + r = -0.375 + -0.125 r = -0.375 + -0.125 Combine like terms: -0.375 + -0.125 = -0.5 r = -0.5 Simplifying r = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. r = {0.25, -0.5}

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