For the first one i used the substitution method

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How do you calculate a tight bound run time for these relations?
T(n)=T(n-3)+n^2
T(n) = 4T(n/4)+log^3(n)
For the first one I used the substitution method which gave me n^2 but wasn't right and the second one I used Masters Theorem and got nlog^4(n) which also wasn't right. A thorough explanation would be helpful. 

Reference no: EM13730799

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