1. points v, w, x, y, and z are graphed on a number line. the coordinate of point v is –4. what points are at a distance of 9 units from point v? choose all answers that are correct. a. w = –13 b. x = 5 c. y = 9 d. z = 13 2. points y and z are the same distance from point x on a number line. the coordinate of point x is –7 and the coordinate of point y is –1.what is the coordinate of point z?

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if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this