Given the function f ( n ) = 2n^4-4n^3-30n^2

Question

its f-intercept is (0,0)

its n-intercepts are 

Answer 1

f(n)= 2n⁴ -4n³ -30n²

f(0)= factored polynomial 2n²(n² -2n-15)

n² -5n+3n -15

n(n-5)+3(n-5)

2n² (n+3) (n-5)=0

when f(0) then n intercept are 0,-3,5