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In factoring out the greatest common factor as an expression, we would do the same thing as if we had some regular terms there. So, our terms are simply just 5 times x minus 3 and y times x minus 3. So if we were to find the GCF, we know that we just have 5 times x minus 3 and y times x minus 3. Notice, that we have the x minus 3 in common. So our GCF is x minus 3. Remember, what we are going to do is place that ahead of everything else out in front. We've got x minus 3 and then (remember we are going to draw parenthesis) and whatever is in the parenthesis is what's left over from all this. So the left over bit is actually the 5 and the y. So this is actually fully factored. If you want, you can always switch the y and the 5 around. It doesn't matter. It doesn't mean that it changes anything, it just changes the way it looks. So, either answer would be correct.