Question: Find the limit, if it exists, or type N if it does not exist. (Hint: use polar coordinates.) lim (x,y)--(0,0) (7x^3+8y^3)/(x^2+y^2) I know that x^2+y^2=r^2

Find the limit, if it exists, or type N if it does not exist.
(Hint: use polar coordinates.)


lim (x,y)--(0,0)          (7x^3+8y^3)/(x^2+y^2)     


I know that x^2+y^2=r^2 but can't seem to compute the numerator. A solution and explanation would be wonderful. 

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