Factor the polynomials completely. if the polynomial cannot be factored, write "prime." 4) 144-m^2 5) y^2+24y+144 6) x^4-625 7) 7(a+9)-y(a+9) 8) x^2 +25 9) y^2-4y-77

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?