A boy is standing on a flat field and tosses his ball toward a second boy standing at the other end of the field. The path of the ball is a parabola, and the equation of the path is $f(x)=-4 x^{2}+8 x$. Based on this information, answer the question.
-The parabola opens up.

Question

Quizplus · Accepted Answer

The coefficient of $x^2$ in the equation $f(x)=-4x^2+8x$ is negative, indicating that the parabola opens downward.

A Boy Is Standing on a Flat Field and Tosses f(x)=−4x2+8xf(x)=-4 x^{2}+8 xf(x)=−4x2+8x

A Boy Is Standing on a Flat Field and Tosses $f(x)=-4 x^{2}+8 x$