Question

find the intercepts of the polynomial x^4-9x^2

Answer 1

x^4-9x^2
=x^2(x^2-9)
=x*x*(x-3)(x+3)
can you go on ?

Answer 2

yes! I had the x^2(x^2-9) I just wasn't sure if that was right. So I factor the x^2-9 to get the (x-3)(x+3) correct?

Answer 3

correct

Answer 4

so how do you get the point of -20 when graphing?

Answer 5

the y is -20 when x is -2