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f(1) = 1²+2.1-1=2
f(2) = 2²+2.2-1=7
f(3) = 3²+2.3-1=14
f(4) = 4²+2.4-1=23
f(5) = 5²+2.5-1=34
R={2,7,14,23,34}
b.f(6) = 6²+2.6-1=47