Question

3^(x+1)+ 5×3^(x-1)- 7×3^x+21=0
Please help in finding the Value of x.

Answer 1

write the given factored in simplest forms i.e.

3*3^x+5*3*^x/3-7*3^x+21=0
now take 3^x common
and on further solving you will get the value of X as 2

Answer 2

the answer is 0

tq

i dont tell full method because i use a simple trick