Q. 99 C

# Find the value of x so that(21 + 41 + 61 +81)x = 1

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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