3x + 3y + ax + ay

which is (3+a)(x+y)

Yes, that's correct!

The expression 3x + 3y + ax + ay can be simplified by combining like terms. To do this, we look for terms that have the same variable raised to the same exponent. In this case, we have x terms and y terms.

Combining the x terms:
3x + ax = (3 + a)x

Combining the y terms:
3y + ay = (3 + a)y

Putting it all together, the simplified expression is:
(3 + a)x + (3 + a)y

To simplify the expression, we can combine the like terms:

3x + ax + 3y + ay

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

Therefore, 3x + 3y + ax + ay simplifies to:

(3 + a)x + (3 + a)y