Question

pls give fast.....
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Answer 1

Answer:

for x,

when we multiple the digits of same no. so their power is added...

for value of x,

power will be added..

4-5=-1

so the value of x should be -1

(1/7)^x= -1

Answer 2

a^m× a^n= a^m*n

(1/7)^4*(-5)= (1/7)^(-20)

∴x= -20