Lena told her mother that the jeans that she bought were on sale for 10 percent off and she had saved $8.25 on them. (useless chart)
lena’s mother wanted to know the price of the jeans before the discount to determine if lena was shopping for jeans that were too expensive. what was the price of the jeans before the discount?
$41.25
$74.25
$82.50
$90.75
plz halp quick

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