R*r=(r-5)*(r-5)+81

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Solution for R*r=(r-5)*(r-5)+81 equation: 


Simplifying
R * r = (r + -5)(r + -5) + 81

Multiply R * r
rR = (r + -5)(r + -5) + 81

Reorder the terms:
rR = (-5 + r)(r + -5) + 81

Reorder the terms:
rR = (-5 + r)(-5 + r) + 81

Multiply (-5 + r) * (-5 + r)
rR = (-5(-5 + r) + r(-5 + r)) + 81
rR = ((-5 * -5 + r * -5) + r(-5 + r)) + 81
rR = ((25 + -5r) + r(-5 + r)) + 81
rR = (25 + -5r + (-5 * r + r * r)) + 81
rR = (25 + -5r + (-5r + r2)) + 81

Combine like terms: -5r + -5r = -10r
rR = (25 + -10r + r2) + 81

Reorder the terms:
rR = 25 + 81 + -10r + r2

Combine like terms: 25 + 81 = 106
rR = 106 + -10r + r2

Solving
rR = 106 + -10r + r2

Solving for variable 'r'.

Reorder the terms:
-106 + 10r + rR + -1r2 = 106 + -10r + r2 + -106 + 10r + -1r2

Reorder the terms:
-106 + 10r + rR + -1r2 = 106 + -106 + -10r + 10r + r2 + -1r2

Combine like terms: 106 + -106 = 0
-106 + 10r + rR + -1r2 = 0 + -10r + 10r + r2 + -1r2
-106 + 10r + rR + -1r2 = -10r + 10r + r2 + -1r2

Combine like terms: -10r + 10r = 0
-106 + 10r + rR + -1r2 = 0 + r2 + -1r2
-106 + 10r + rR + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
-106 + 10r + rR + -1r2 = 0

The solution to this equation could not be determined.

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