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21 August, 14:12

A ball is thrown straight up from height of 3 ft with a speed of 32 ft/s. its height above the ground after X seconds is given by the quadratic function y=-16x^2+32x+3

Explain the steps you would use to determine the path of the ball in terms of a transformation of the graph of Y=x^2

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  1. 21 August, 14:35
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    The given equation has a y-intercept at (0, 3).

    y = - 16x^2 + 32x + 3 = - 16 (x^2 - 2x) + 3 = - 16 (x - 1) ^2 + 19. This means the vertex is at (1, 19).

    To transform the y = x^2 graph:

    First we invert the graph with respect to the x-axis, maxing it a downward parabola y = - x^2.

    Next, we move its vertex from the origin (0, 0) to (1, 19), making the equation y = - (x - 1) ^2 + 19.

    Third, we "expand" the opening of the parabola such that it passes through the y-intercept of (0, 3). The right-side of the parabola should also be expanded similarly, since it is symmetric.
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