Question

Factorise the following by grouping the terms:
9 + 3xy + x²y + 3x

Answer 1

9 + 3xy + x²y + 3x
= 9 + 3xy + 3x + x²y
= (9 + 3xy) + (3x + x²y)
= 3(3 + xy) + x(3 + xy)
= (3 + xy)(3 + x).