SOLUTION: Which rule below represents a quadratic function with vertex (4 ,-5) and passing through the point (0, -1)? y=(x-4)^2-5 y=(x-4)(x+5)-1 y = 0.25 (x - 4)^2 - 5

Algebra ->  Expressions-with-variables -> SOLUTION: Which rule below represents a quadratic function with vertex (4 ,-5) and passing through the point (0, -1)? y=(x-4)^2-5 y=(x-4)(x+5)-1 y = 0.25 (x - 4)^2 - 5      Log On


   

Question 983058:
Which rule below represents a quadratic function with vertex (4 ,-5) and passing through the point (0, -1)?
y=(x-4)^2-5
y=(x-4)(x+5)-1
y = 0.25 (x - 4)^2 - 5
y = 0.12 (x - 4)^2 - 5

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Start with vertex form,
y=a%28x-4%29%5E2-5
Use the point.
-1=a%280-4%29%5E2-5
-1=a%2816%29-5
a%2816%29=4
a=4%2F16
a=1%2F4
y=%281%2F4%29%28x-4%29%5E2-5
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