The equation of a projectile is $y=a x-b x^2$. Its horizontal range is ......
The equation of a projectile is $y=a x-b x^2$. Its horizontal range is ......
- A
$\frac{a}{b}$
- B
$\frac{b}{a}$
- C
$a+b$
- D
$b-a$
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