usethe intermediate theorem to show that the polynomial function has a zero in the given interval

Question

f(x)=18x^4-8x^2+9x-1;[0,3)

can you please me how you got the answer

Answer 1

f(0) = -1
f(3) > 0
so, to get from -1 to a positive value, it must pass through zero, because f is continuous.