Question

If (3¹⁻ⁿ)/(9⁻²ⁿ) = ⅑, find n

Answer 1

Answer:

used formulae

$\frac{a {}^{n} }{a {}^{m} } = {a}^{n - m}$

$\frac{1}{a {}^{n} } = {a}^{ - n}$