15t is a monomial
3 x 5 x T
It is 7x3b
Any polynomial in which there are at least two co-prime coefficients will have 1 as the greatest monomial factor.
(x + 1) and (x + 2) are monomial factors of the polynomial x2 + 3x + 2. (x + 1) and (x + 3) are monomial factors of the polynomial x2 + 4x + 3. (x + 1) is a common monomial factor of the polynomials (x2 + 3x + 2) and (x2 + 4x + 3)
15t² - 15t - 30 = 15(t - 2)(t + 1)