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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