Question 201866
126a(-1/9 a) (1/7 a^3)
.
126 *a^1 *(-1/9) *a^1 *(1/7) *a^3
.
multiply  numbers,,,,,multiply  variables  by  adding  exponents
.
(126*-1/9*1/7) * ( a^ (1+1+3) )
.
-2 a^5
.
check  let  a=2,,both  original  and  answer  = -64