Question

if 3^2×-1=81, what is the value of x?

Answer 1

it wrong, 3^2 =9  

9 x -1= -81.

it always negative put on it.

Answer 2

hello :
3^(2×-1)=81
3^(2×-1) = 3^4
2x-1 =4
2x=5
x=5/2