Question

\(\frac{\left(-3_{ }\right)^n}{81}\)= -27

tìm n

Answer 1

\(\frac{\left(-3\right)^n}{81}=-27\Leftrightarrow\left(-3\right)^n=-27.81=-2187=\left(-3\right)^7\Rightarrow n=7\)

Answer 2

\(\frac{\left(-3\right)^n}{81}=-27\)

=> \(\left(-3\right)^n=81.\left(-27\right)\)

=>\(\left(-3\right)^n=-2187\)

=> \(\left(-3\right)^n=\left(-3\right)^7\)

=>\(n=7\)