SOLUTION: I am just checking if I am doing this right, I am multiplying radicals (3 sqrt 5 - 9 sqrt 3)(4 sqrt 5 + 12 sqrt 3). I did foil and I came up with the answer -264. Is that right?

Question 236495: I am just checking if I am doing this right, I am multiplying radicals
(3 sqrt 5 - 9 sqrt 3)(4 sqrt 5 + 12 sqrt 3).
I did foil and I came up with the answer -264. Is that right?
Thank you
Found 2 solutions by Earlsdon, JimboP1977:
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Congratulations! That's the correct answer!
Answer by JimboP1977(311) (Show Source): You can put this solution on YOUR website!
I make it that as well but you should show your workings.
What were your workings?
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