(√21+5) (√21-5)
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Answer:
-4
Step-by-step explanation:
hii fella , see it here
(√21+5) (√21-5)
so there is an expansion/formula i.e :- (a+b) (a-b) = a^2 - b^2
so if we apply this expansion to your question then we get :-
√21^2 - 5^2 = 21 - 25 = -4
hope i helped
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