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1.can a quadratic function be just set to 1 number e.g. 5 or can it be a bigger number. at the moment im working on numbers below 10 to get used to the formulas.

2. is this correct how i am doing it?

formula

N --> N

^{2}--> 3N

^{2}+ 4

e.g.

N =5

5 x 5 = 25 = N

^{2}

5 x 25 = 75 = 3N

^{2}

N = 79 answer

is that correct?