Question

solve that problem anyone

Answer 1

We have,

2ˣ⁺² +2ˣ⁻¹ = 9

Or 2ˣ × 2² + 2ˣ (2)⁻¹ = 9

Or 4 × 2ˣ + 1/2 × 2ˣ = 9

Or 2ˣ(4+1/2) = 9

Or 2ˣ(9/2) = 9

Or 2ˣ = 2

Or x = 1