355.134=6.28R^2+66.568R

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Solution for 355.134=6.28R^2+66.568R equation:


Simplifying
355.134 = 6.28R2 + 66.568R

Reorder the terms:
355.134 = 66.568R + 6.28R2

Solving
355.134 = 66.568R + 6.28R2

Solving for variable 'R'.

Reorder the terms:
355.134 + -66.568R + -6.28R2 = 66.568R + -66.568R + 6.28R2 + -6.28R2

Combine like terms: 66.568R + -66.568R = 0.000
355.134 + -66.568R + -6.28R2 = 0.000 + 6.28R2 + -6.28R2
355.134 + -66.568R + -6.28R2 = 6.28R2 + -6.28R2

Combine like terms: 6.28R2 + -6.28R2 = 0.00
355.134 + -66.568R + -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'.
-56.55 + 10.6R + R2 = 0

Move the constant term to the right:

Add '56.55' to each side of the equation.
-56.55 + 10.6R + 56.55 + R2 = 0 + 56.55

Reorder the terms:
-56.55 + 56.55 + 10.6R + R2 = 0 + 56.55

Combine like terms: -56.55 + 56.55 = 0.00
0.00 + 10.6R + R2 = 0 + 56.55
10.6R + R2 = 0 + 56.55

Combine like terms: 0 + 56.55 = 56.55
10.6R + R2 = 56.55

The R term is 10.6R.  Take half its coefficient (5.3).
Square it (28.09) and add it to both sides.

Add '28.09' to each side of the equation.
10.6R + 28.09 + R2 = 56.55 + 28.09

Reorder the terms:
28.09 + 10.6R + R2 = 56.55 + 28.09

Combine like terms: 56.55 + 28.09 = 84.64
28.09 + 10.6R + R2 = 84.64

Factor a perfect square on the left side:
(R + 5.3)(R + 5.3) = 84.64

Calculate the square root of the right side: 9.2

Break this problem into two subproblems by setting 
(R + 5.3) equal to 9.2 and -9.2.

Subproblem 1

R + 5.3 = 9.2 Simplifying R + 5.3 = 9.2 Reorder the terms: 5.3 + R = 9.2 Solving 5.3 + R = 9.2 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-5.3' to each side of the equation. 5.3 + -5.3 + R = 9.2 + -5.3 Combine like terms: 5.3 + -5.3 = 0.0 0.0 + R = 9.2 + -5.3 R = 9.2 + -5.3 Combine like terms: 9.2 + -5.3 = 3.9 R = 3.9 Simplifying R = 3.9

Subproblem 2

R + 5.3 = -9.2 Simplifying R + 5.3 = -9.2 Reorder the terms: 5.3 + R = -9.2 Solving 5.3 + R = -9.2 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-5.3' to each side of the equation. 5.3 + -5.3 + R = -9.2 + -5.3 Combine like terms: 5.3 + -5.3 = 0.0 0.0 + R = -9.2 + -5.3 R = -9.2 + -5.3 Combine like terms: -9.2 + -5.3 = -14.5 R = -14.5 Simplifying R = -14.5

Solution

The solution to the problem is based on the solutions from the subproblems. R = {3.9, -14.5}

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