a)
a_n=n^3-5n^2-5n+25
a_1=1^3-5*1^2-5*1+25=-4-5+25=16
a_2=2^3-5*2^2-5*2+25=8-20-10+25=-22+25=3
a_3=3^3-5*3^3-5*3+25=9-45-15+25=26
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b)
a_n=\frac{6n-16}{2n-7}
a_1=\frac{6*1-16}{2*1-7}=\frac{-10}{-5}=2
a_2=\frac{6*2-16}{2*2-7}=\frac{-4}{-3}=1\frac{1}{3}
a_3=\frac{6*3-16}{2*3-7}=\frac{2}{-1}=-2
a_4=\frac{6*4-16}{2*4-7}=\frac{8}{1}=8
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