27346.6368=2*3.14*r*r+2*3.14*r*242.4

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Solution for 27346.6368=2*3.14*r*r+2*3.14*r*242.4 equation:


Simplifying
27346.6368 = 2 * 3.14r * r + 2 * 3.14r * 242.4

Multiply 2 * 3.14
27346.6368 = 6.28r * r + 2 * 3.14r * 242.4

Multiply r * r
27346.6368 = 6.28r2 + 2 * 3.14r * 242.4

Reorder the terms for easier multiplication:
27346.6368 = 6.28r2 + 2 * 3.14 * 242.4r

Multiply 2 * 3.14
27346.6368 = 6.28r2 + 6.28 * 242.4r

Multiply 6.28 * 242.4
27346.6368 = 6.28r2 + 1522.272r

Reorder the terms:
27346.6368 = 1522.272r + 6.28r2

Solving
27346.6368 = 1522.272r + 6.28r2

Solving for variable 'r'.

Reorder the terms:
27346.6368 + -1522.272r + -6.28r2 = 1522.272r + -1522.272r + 6.28r2 + -6.28r2

Combine like terms: 1522.272r + -1522.272r = 0.000
27346.6368 + -1522.272r + -6.28r2 = 0.000 + 6.28r2 + -6.28r2
27346.6368 + -1522.272r + -6.28r2 = 6.28r2 + -6.28r2

Combine like terms: 6.28r2 + -6.28r2 = 0.00
27346.6368 + -1522.272r + -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'.
-4354.56 + 242.4r + r2 = 0

Move the constant term to the right:

Add '4354.56' to each side of the equation.
-4354.56 + 242.4r + 4354.56 + r2 = 0 + 4354.56

Reorder the terms:
-4354.56 + 4354.56 + 242.4r + r2 = 0 + 4354.56

Combine like terms: -4354.56 + 4354.56 = 0.00
0.00 + 242.4r + r2 = 0 + 4354.56
242.4r + r2 = 0 + 4354.56

Combine like terms: 0 + 4354.56 = 4354.56
242.4r + r2 = 4354.56

The r term is 242.4r.  Take half its coefficient (121.2).
Square it (14689.44) and add it to both sides.

Add '14689.44' to each side of the equation.
242.4r + 14689.44 + r2 = 4354.56 + 14689.44

Reorder the terms:
14689.44 + 242.4r + r2 = 4354.56 + 14689.44

Combine like terms: 4354.56 + 14689.44 = 19044
14689.44 + 242.4r + r2 = 19044

Factor a perfect square on the left side:
(r + 121.2)(r + 121.2) = 19044

Calculate the square root of the right side: 138

Break this problem into two subproblems by setting 
(r + 121.2) equal to 138 and -138.

Subproblem 1

r + 121.2 = 138 Simplifying r + 121.2 = 138 Reorder the terms: 121.2 + r = 138 Solving 121.2 + r = 138 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-121.2' to each side of the equation. 121.2 + -121.2 + r = 138 + -121.2 Combine like terms: 121.2 + -121.2 = 0.0 0.0 + r = 138 + -121.2 r = 138 + -121.2 Combine like terms: 138 + -121.2 = 16.8 r = 16.8 Simplifying r = 16.8

Subproblem 2

r + 121.2 = -138 Simplifying r + 121.2 = -138 Reorder the terms: 121.2 + r = -138 Solving 121.2 + r = -138 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-121.2' to each side of the equation. 121.2 + -121.2 + r = -138 + -121.2 Combine like terms: 121.2 + -121.2 = 0.0 0.0 + r = -138 + -121.2 r = -138 + -121.2 Combine like terms: -138 + -121.2 = -259.2 r = -259.2 Simplifying r = -259.2

Solution

The solution to the problem is based on the solutions from the subproblems. r = {16.8, -259.2}

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