Question

find all real zeros of the polynomial function
f(x)=-5x^4+80x^2
A) x=0, x=+-4
B) x=0,x=16
C) x=0, x=4
D)x=0, x=+-16

Answer 1

1. Set it equal to 0
2. Factor out 5x^2
3. Set each factor equal to 0
4. Solve each equation

Answer 2

so i plug in a 0 for every x i see? @Mertsj