How do I find the solution to #8^(x-1) - 2^-x# ?
1 Answer
Sep 8, 2017
Explanation:
#"express "8^(x-1)" in base 2"#
#rArr(2^3)^((x-1))=2^(-x)#
#rArr2^(3x-3)=2^(-x)#
#"we can now equate the exponents"#
#rArr3x-3=-x#
#rArr4x=3rArrx=3/4#
