factor the trinomial 15a^2-22ab-5b^2
15a² - 22ab - 5b²15a² - 25ab + 3ab - 5b²5a(3a) - 5a(5b) + b(3a) - b(5b)5a(3a - 5b) + b(3a - 5b)(5a + b)(3a - 5b)