Question

How do you factor `4x^2 + 20x + 5y +xy`?

Answer 1

Factor by grouping:

`4x^2 + 20x + 5y +xy = (4x^2 + 20x) + (5y +xy)`

`= 4x(x+5)+y(5+x) = 4x(x+5)+y(x+5)`

`= (4x+y)(x+5)`