Find a rational zero of the polynomial function and use it to find all the zeros of the function. 40) f(x) = x3 + 2x2 - 9x - 18 41) f(x) = 3x3 - x2 - 18x + 6Find an nth degree polynomial function with real coefficients satisfying the given conditions. 44) n = 3; - 5 and i are zeros; f(-3) = 60 Use Descartes's Rule of Signs to determine the possible number of positive and negative real zeros for the given function. 45) f(x) = 7x3 - 6x2 + x + 3.5 46) f(x) = x7 + x6 + x2 + x+4 Find the domain of the rational function. 47) h(x) =. x+9 x2 - 25 x+8 48) f(x) = x2 - 4x