meg_1_2_3_4_5
Member
- Joined
- Dec 19, 2005
- Messages
- 34
- Gender
- Female
- HSC
- 2006
3^t x 9^(t+1) = 1/3
seems like an easy question, but me and the solutions have conflicting answers. The way i tried to work it out is by making the base the same:
3^t x 3^ (2t +2) = 3^-1
and therefore:
t(2t +2) +1 = 0 (a quadratic equation with no solutions)
the answers stuff up (i think) cos they end up with x= -1, but that is only with a plus between the first 2 terms of the original equation, which would mean a linear equation (x +2x +2 = -1) that is simple to solve.
any help would be appreciated
seems like an easy question, but me and the solutions have conflicting answers. The way i tried to work it out is by making the base the same:
3^t x 3^ (2t +2) = 3^-1
and therefore:
t(2t +2) +1 = 0 (a quadratic equation with no solutions)
the answers stuff up (i think) cos they end up with x= -1, but that is only with a plus between the first 2 terms of the original equation, which would mean a linear equation (x +2x +2 = -1) that is simple to solve.
any help would be appreciated