To determine how far the balloon will travel before it reaches the ground, we need to solve the quadratic equation:
\[ 0 = -x^2 + 12x \]
We can rearrange this to:
\[ x^2 - 12x = 0 \]
Now, we can factor the equation:
\[ x(x - 12) = 0 \]
Setting each factor to zero gives:
- \( x = 0 \)
- \( x - 12 = 0 \) → \( x = 12 \)
Thus, the solutions to the equation are \( x = 0 \) and \( x = 12 \). The balloon will reach the ground when \( x = 12 \) feet.
Therefore, the balloon will travel 12 feet before it reaches the ground.