Question

Find the product of the following binomials.a) (13ax-4) (5ay-1)

Answer 1

$(13ax - 4)(5ay - 1) \\ = 13ax \times 5ay - 13ax \times 1 - 4 \times 5ay + 4 \times 1 \\ = 65a^{2}xy - 13ax - 20ay + 4 \\ = 65a^{2}xy - (13x + 20y)a + 4$