Find the interval in which f(x) is positive or negative : f(x) = (x-1)(x-2)(x-3)

Let f(x)=((x-3)(x+2)(x+6))/((x+1)(x-5)) Find intervals where f(x) is positive or negative

Find the intervals in which the function f given by f(x) = 2x^2 - 3x is

Find the values of x for which f(x) is positive if f(x)=(x^(2)-6x+5)/(x^(2)-5x+6) .

Find the intervals in which the function f given by f(x) = 4x^3 - 6x^2 - 72x + 30 is increasing.