0=6.28r^2+629.256r-3234.1372

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Solution for 0=6.28r^2+629.256r-3234.1372 equation:


Simplifying
0 = 6.28r2 + 629.256r + -3234.1372

Reorder the terms:
0 = -3234.1372 + 629.256r + 6.28r2

Solving
0 = -3234.1372 + 629.256r + 6.28r2

Solving for variable 'r'.

Combine like terms: 0 + 3234.1372 = 3234.1372
3234.1372 + -629.256r + -6.28r2 = -3234.1372 + 629.256r + 6.28r2 + 3234.1372 + -629.256r + -6.28r2

Reorder the terms:
3234.1372 + -629.256r + -6.28r2 = -3234.1372 + 3234.1372 + 629.256r + -629.256r + 6.28r2 + -6.28r2

Combine like terms: -3234.1372 + 3234.1372 = 0.0000
3234.1372 + -629.256r + -6.28r2 = 0.0000 + 629.256r + -629.256r + 6.28r2 + -6.28r2
3234.1372 + -629.256r + -6.28r2 = 629.256r + -629.256r + 6.28r2 + -6.28r2

Combine like terms: 629.256r + -629.256r = 0.000
3234.1372 + -629.256r + -6.28r2 = 0.000 + 6.28r2 + -6.28r2
3234.1372 + -629.256r + -6.28r2 = 6.28r2 + -6.28r2

Combine like terms: 6.28r2 + -6.28r2 = 0.00
3234.1372 + -629.256r + -6.28r2 = 0.00

Begin completing the square.  Divide all terms by
-6.28 the coefficient of the squared term: 

Divide each side by '-6.28'.
-514.99 + 100.2r + r2 = 0

Move the constant term to the right:

Add '514.99' to each side of the equation.
-514.99 + 100.2r + 514.99 + r2 = 0 + 514.99

Reorder the terms:
-514.99 + 514.99 + 100.2r + r2 = 0 + 514.99

Combine like terms: -514.99 + 514.99 = 0.00
0.00 + 100.2r + r2 = 0 + 514.99
100.2r + r2 = 0 + 514.99

Combine like terms: 0 + 514.99 = 514.99
100.2r + r2 = 514.99

The r term is 100.2r.  Take half its coefficient (50.1).
Square it (2510.01) and add it to both sides.

Add '2510.01' to each side of the equation.
100.2r + 2510.01 + r2 = 514.99 + 2510.01

Reorder the terms:
2510.01 + 100.2r + r2 = 514.99 + 2510.01

Combine like terms: 514.99 + 2510.01 = 3025
2510.01 + 100.2r + r2 = 3025

Factor a perfect square on the left side:
(r + 50.1)(r + 50.1) = 3025

Calculate the square root of the right side: 55

Break this problem into two subproblems by setting 
(r + 50.1) equal to 55 and -55.

Subproblem 1

r + 50.1 = 55 Simplifying r + 50.1 = 55 Reorder the terms: 50.1 + r = 55 Solving 50.1 + r = 55 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-50.1' to each side of the equation. 50.1 + -50.1 + r = 55 + -50.1 Combine like terms: 50.1 + -50.1 = 0.0 0.0 + r = 55 + -50.1 r = 55 + -50.1 Combine like terms: 55 + -50.1 = 4.9 r = 4.9 Simplifying r = 4.9

Subproblem 2

r + 50.1 = -55 Simplifying r + 50.1 = -55 Reorder the terms: 50.1 + r = -55 Solving 50.1 + r = -55 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-50.1' to each side of the equation. 50.1 + -50.1 + r = -55 + -50.1 Combine like terms: 50.1 + -50.1 = 0.0 0.0 + r = -55 + -50.1 r = -55 + -50.1 Combine like terms: -55 + -50.1 = -105.1 r = -105.1 Simplifying r = -105.1

Solution

The solution to the problem is based on the solutions from the subproblems. r = {4.9, -105.1}

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