Answer :

Panoyin
        f(x) = 2x + 3
f(2h + 1) = 2(2h + 1) + 3
f(2h + 1) = 2(2h) + 2(1) + 3
f(2h + 1) = 4h + 2 + 3
f(2h + 1) = 4h + 5

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