Question

find the next two numbers -3, 9, -27, 81

Answer 1

Task. Find the next two numbers -3, 9, -27, 81

Solution. First we should find the law for these numbers.

Notice that

$\frac{9}{-3}=\frac{-27}{9}=\frac{81}{-27}=-3.$

In other words each number is obtained by multiplication of the previous number by $-3$. Therefore the next two numbers are

$81*(-3)=-243$

and

$-243*(-3)=729.$

Answer. $-243$, $729$.