To find out how far the balloon will travel before it reaches the ground, we need to solve the equation:
\[ 0 = -x^2 + 12x \]
We can factor this equation:
\[ 0 = x(-x + 12) \]
Setting each factor equal to zero gives us:
- \( x = 0 \) (This represents the initial position when the balloon is fired.)
- \( -x + 12 = 0 \) which simplifies to \( x = 12 \).
Thus, the balloon will reach the ground when \( x = 12 \) feet.
So, the balloon will travel 12 feet before it reaches the ground.