Posted by M. Pannell on Tuesday, December 18, 2012 at 11:07am.
avg rate is slope of secant:
[f(x)-f(1)]/[x-1]
= [(x^3+x)-(1^3+1)]/[x-1]
= (x^3+x-2)/(x-1)
= x^2+x+2
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