Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of
21.3 m/sec. The function that represents the height of the ball with respect to time is ℎ 𝑥 =
−4.9𝑥2 + 21.3𝑥. About how many seconds will it take for the ball to hit the ground?

Question

Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of
21.3 m/sec. The function that represents the height of the ball with respect to time is ℎ 𝑥 =
−4.9𝑥2 + 21.3𝑥. About how many seconds will it take for the ball to hit the ground?

saylilbaby · Answer

@Hero @dan815 @Michele_Laino @Teddyiswatshecallsme

freckles · Answer

$$h(x)=-4.9x^2+21.3x  ?$$
we want to know what x is when the ball hits the ground
well when the ball hits the ground the height between the ball and the ground is 0
so you want to solve for x when h(x)=0

saylilbaby · Answer

can you set the equation up and ill solve it pls @freckles

freckles · Answer

so you are having trouble replacing h(x) with 0?

freckles · Answer

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