What would be the expression to find the nth term?

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The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2