r^3+8r^2+9R-18=0

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Solution for r^3+8r^2+9R-18=0 equation:


Simplifying
r3 + 8r2 + 9R + -18 = 0

Reorder the terms:
-18 + 9R + 8r2 + r3 = 0

Solving
-18 + 9R + 8r2 + r3 = 0

Solving for variable 'R'.

Move all terms containing R to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 9R + 8r2 + 18 + r3 = 0 + 18

Reorder the terms:
-18 + 18 + 9R + 8r2 + r3 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 9R + 8r2 + r3 = 0 + 18
9R + 8r2 + r3 = 0 + 18

Combine like terms: 0 + 18 = 18
9R + 8r2 + r3 = 18

Add '-8r2' to each side of the equation.
9R + 8r2 + -8r2 + r3 = 18 + -8r2

Combine like terms: 8r2 + -8r2 = 0
9R + 0 + r3 = 18 + -8r2
9R + r3 = 18 + -8r2

Add '-1r3' to each side of the equation.
9R + r3 + -1r3 = 18 + -8r2 + -1r3

Combine like terms: r3 + -1r3 = 0
9R + 0 = 18 + -8r2 + -1r3
9R = 18 + -8r2 + -1r3

Divide each side by '9'.
R = 2 + -0.8888888889r2 + -0.1111111111r3

Simplifying
R = 2 + -0.8888888889r2 + -0.1111111111r3

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