on a question like this u need to see that 4 can be written as 2 squared
so 4^x can be written as (2^2)^x
using bracket indicie rules that becomes 2^2x
so if 2 to the power of 1-x = 2 to the power 2x
then the powers are equal hence 1-x=2x
solve for x
so 4^x can be written as (2^2)^x
using bracket indicie rules that becomes 2^2x
so if 2 to the power of 1-x = 2 to the power 2x
then the powers are equal hence 1-x=2x
solve for x
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