Jontavious wants to have $20,000 for a car in 8 years. He finds an account that earns 13% interest, compounded quarterly. How much does Jontavious need to invest to have at least $20,000 in 8 years?

X = -3, g(x) = 0
x = -2, g(x) = 2(-2 + 3)^2 - 1 = 2(1) - 1 = 1
x = -1, g(x) = 2(-1 + 3)^2 - 1 = 2(4) - 1 = 7
x = 0, g(x) = 2(0 + 3)^2 - 1 = 2(9) - 1 = 17
x = 1, g(x) = 2(1 + 3)^2 - 1 = 2(16) - 1 = 31
x = 2, g(x) = 2(2 + 3)^2 - 1 = 2(25) - 1 = 49
x = 3, g(x) = 2(3 + 3)^2 - 1 = 2(36) - 1 = 71

graph the function base on those values above