Asked by andy
if 9^y=x, which of the following represents 9^y-9^(y-3)
A) 1/x^3
B) x^3
C) 729x
D) 729/728 x
E) 728/729 x
A) 1/x^3
B) x^3
C) 729x
D) 729/728 x
E) 728/729 x
Answers
Answered by
Steve
9^y = x, so
9^y-9^(y-3) = 9^y - 9^y/9^3 = x - x/729 = ...
9^y-9^(y-3) = 9^y - 9^y/9^3 = x - x/729 = ...
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