Select all of the expressions that are equivalent to 4 to the root of 5

Y=4x^2+x-1 solve using quadratic formula

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

State how many imaginary and real zeros the function has. f(x) = x3 - 20x2 + 123x - 216