Francis heard that a care stereo system was on sale for 30% off. If the sale price was $57.75, what was the original price of th
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we can see that
the above curve is parabola
so, firstly , we can find vertex
vertex is (4,0)
now, we can use vertex formula of parabola
we can plug h and k
and we get
so, we can factor it as
............Answer