I need this is about 30mins pls. what is the explicit equation of the following quadratic sequence?

3, 1, -5, -15, -29

explicit equation: Ax^2+Bx+C​

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

Write the equations in logarithmic form 10^3=1,000