Q. 99 C
Find the value of x so that
(21 + 41 + 61 +81)x = 1
Answer :
from the laws of exponents , we have ,
So , we have , (21 + 41 + 61 +81)x = 
= 
= 
Now , we have , 
= 1
As we know , a0 = 1
So , 
= 1 can be only possible when x=0.
∴ x = 0.
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