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Modeling the Path of a Golf Ball

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The path traveled by a golf ball hit with a 9-iron can be modeled with quadratic function, y= -0.042X 2 + 5X, where x is the distance in yards from the point it was hit and y is the height of the golf ball in feet. Assume that the ground is level.

A. Find the maximum height reached by the ball.
B. How far from where it was hit does the ball hit the ground?

In the quadratic equation on top X2 is a small 2 near the X.

Please break down the full equation, so that I can see how you arrive at your answer for these two questions.

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(1) y = 0.042x² + 5x
y = 0.042[x²  (5/0.042)x] = 0.042[x²  119.05x]
To complete the square, add and ...

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