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Surds. Is the answer 6*sqrt7-20?
I agree with @ Dilly! (:
@Elisha Mehta, you have got your method wrong.
First I would split the equation into brackets: (7+9sqrt)x(7-3sqrt)x(7-27)
As you can see part c can be simplified to (-21)
Now we can multiply part a with b: 49+2 21sqrt-27 sqrt -21
Therefore your final answer is 28+2 21sqrt- 27sqrt.
This question seemed a bit dodgy to me but I hope my answer helps!