Question 656917
Find the limit as x approaches 4 of the function (u^4-256)/(u^3-64)
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{{{(u^4-256)/(u^3-64) = (u^2 + 16)*(u - 4)*(u+4)/((u-4)*(u^2 + 16u + 16))}}}
= {{{(u^2 + 16)*(u+4)/((u^2 + 4u + 16))}}}
@ u = 4: = 32*8/(16 + 16 + 16)
= 256/48
= 16/3