The given general formula is
Distance = 4.9x², where x is in seconds
The first case is when the time is after x² seconds. So, if x=x²,
Distance = (4.9)(x²)²
From the laws of exponents, we multiply 2*2.
Distance = 4.9x⁴ meters
The second case is when the time is after x³ seconds. So, if x=x³,
Distance = 4.9(x³)²
Distance = 4.9x⁶ meters