Find the exact roots of the polynomial; write the roots in simplest radical form, if necessary.
f(x)=7x^3-11x^2-10x+8
my professor mentioned that the roots are: 2, 1 and 4/7. but i don't know she came up with 4/7. me.

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?