SOLUTION: use the intermediate value theorem to show that the polynomial function, has a zero in the given interval
f(x)=x^5-x^4+9x^3-8x^2-13x+9+ {1.2.1.5}
Hi
f(x)=x^5-x^4+9x^3-8x^2-13x+9
f(1.2) = -2.1533
f(1.5) = 4.4063
According to the intermediate value theorem,
function has a zero in the given interval