NO. IM SORRY. I DID NOT MEANT THAT. DONT TRUST MY ANSWER.
Delete my answer due to my stupidity
Answer:
answer is 362,880
Step-by-step explanation:
9!= 9×8×7×6×5×4×3×2×1=362,880
I attached a picture, see if you can see what I'm doing. Basically, I start by squaring everything to get rid of the radical, but just remember at the end to always, always check your answers, because squaring your answers could get rid of some negative numbers that could result in imaginary answers. The answer I came up with was a=5,-2