Answer :

cs88811

Answer:

Part I:

y = (x - 4) (x - 5)

Part I:

(4.5, -0.25)

Part III:

y-intercept (0,20)

x-intercepts (4,0) and (5,0)

Step-by-step explanation:

Answer:

Step-by-step explanation:

x^2 -9x + 20 =0      factors to

(x-5)(x-4) = 0      which shows  the zeroes are at x = 5 and 4

            the x value of the vertex is exactly in between at 4.5

         use this value in the quadratic to calculate 'y'

             y = (4.5)^2 - 9( 4.5) + 20    = - 1/4

Vertex is at   (4.5, - 1/4)

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