6.28(r)(r)+62.8(r)=603

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Solution for 6.28(r)(r)+62.8(r)=603 equation:


Simplifying
6.28(r)(r) + 62.8(r) = 603

Multiply r * r
6.28r2 + 62.8(r) = 603

Reorder the terms:
62.8r + 6.28r2 = 603

Solving
62.8r + 6.28r2 = 603

Solving for variable 'r'.

Reorder the terms:
-603 + 62.8r + 6.28r2 = 603 + -603

Combine like terms: 603 + -603 = 0
-603 + 62.8r + 6.28r2 = 0

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

Divide each side by '6.28'.
-96.01910828 + 10r + r2 = 0

Move the constant term to the right:

Add '96.01910828' to each side of the equation.
-96.01910828 + 10r + 96.01910828 + r2 = 0 + 96.01910828

Reorder the terms:
-96.01910828 + 96.01910828 + 10r + r2 = 0 + 96.01910828

Combine like terms: -96.01910828 + 96.01910828 = 0.00000000
0.00000000 + 10r + r2 = 0 + 96.01910828
10r + r2 = 0 + 96.01910828

Combine like terms: 0 + 96.01910828 = 96.01910828
10r + r2 = 96.01910828

The r term is 10r.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10r + 25 + r2 = 96.01910828 + 25

Reorder the terms:
25 + 10r + r2 = 96.01910828 + 25

Combine like terms: 96.01910828 + 25 = 121.01910828
25 + 10r + r2 = 121.01910828

Factor a perfect square on the left side:
(r + 5)(r + 5) = 121.01910828

Calculate the square root of the right side: 11.000868524

Break this problem into two subproblems by setting 
(r + 5) equal to 11.000868524 and -11.000868524.

Subproblem 1

r + 5 = 11.000868524 Simplifying r + 5 = 11.000868524 Reorder the terms: 5 + r = 11.000868524 Solving 5 + r = 11.000868524 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = 11.000868524 + -5 Combine like terms: 5 + -5 = 0 0 + r = 11.000868524 + -5 r = 11.000868524 + -5 Combine like terms: 11.000868524 + -5 = 6.000868524 r = 6.000868524 Simplifying r = 6.000868524

Subproblem 2

r + 5 = -11.000868524 Simplifying r + 5 = -11.000868524 Reorder the terms: 5 + r = -11.000868524 Solving 5 + r = -11.000868524 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = -11.000868524 + -5 Combine like terms: 5 + -5 = 0 0 + r = -11.000868524 + -5 r = -11.000868524 + -5 Combine like terms: -11.000868524 + -5 = -16.000868524 r = -16.000868524 Simplifying r = -16.000868524

Solution

The solution to the problem is based on the solutions from the subproblems. r = {6.000868524, -16.000868524}

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