5.5+2r=36+r^2

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Solution for 5.5+2r=36+r^2 equation:


Simplifying
5.5 + 2r = 36 + r2

Solving
5.5 + 2r = 36 + r2

Solving for variable 'r'.

Reorder the terms:
5.5 + -36 + 2r + -1r2 = 36 + r2 + -36 + -1r2

Combine like terms: 5.5 + -36 = -30.5
-30.5 + 2r + -1r2 = 36 + r2 + -36 + -1r2

Reorder the terms:
-30.5 + 2r + -1r2 = 36 + -36 + r2 + -1r2

Combine like terms: 36 + -36 = 0
-30.5 + 2r + -1r2 = 0 + r2 + -1r2
-30.5 + 2r + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
-30.5 + 2r + -1r2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
30.5 + -2r + r2 = 0

Move the constant term to the right:

Add '-30.5' to each side of the equation.
30.5 + -2r + -30.5 + r2 = 0 + -30.5

Reorder the terms:
30.5 + -30.5 + -2r + r2 = 0 + -30.5

Combine like terms: 30.5 + -30.5 = 0.0
0.0 + -2r + r2 = 0 + -30.5
-2r + r2 = 0 + -30.5

Combine like terms: 0 + -30.5 = -30.5
-2r + r2 = -30.5

The r term is -2r.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2r + 1 + r2 = -30.5 + 1

Reorder the terms:
1 + -2r + r2 = -30.5 + 1

Combine like terms: -30.5 + 1 = -29.5
1 + -2r + r2 = -29.5

Factor a perfect square on the left side:
(r + -1)(r + -1) = -29.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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