Question

Please help me. I have no idea to this question.
a) 3ax+3ay-bx-by
b) 10ay²-5by²+2a²y-aby

Answer 1

a)3a(x+y)-b(x+y)

=(3a-b)(x+y)

b)5y(2ay-by)+a(2ay-by)

=(5y+a)(2ay-by)