SOLUTION: Write the equation of the quadratic function with roots -1 and 1 and a vertex at (0, -3)

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Question 654596: Write the equation of the quadratic function with roots -1 and 1 and a vertex at (0, -3)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

quadratic functionhighlight%28y%29 with roots -1 and 1 and a vertex at (0, -3)

 y = a(x+1)(x-1)   ||using (x,y) ordered pair (0,-3) to solve for a

 -3+=+a%280%2B1%29%2A%280-1%29

 -3+=+a%2A1%2A-1

    -3 = -a

    3 = a 

 y = 3(x+1)(x-1)  0r y = 3(x^2 - 1)