If 3^{x + 1} = 9^{x - 2}, the value of x is :

1. -5

2. 5

3. 0

4. 3

Solve for x :

2^{5x - 1} = 4 × 2^{3x + 1}

Solve for x :

3^{4x + 1} = (27)^{x + 1}