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   giorgiana1976 Teacher
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   The second grade function is described by the expression:

   f(x)=ax^2 + bx + c

   f(-1)=1

   f(-1)=a*(-1)^2 + b*(-1) + c=a-b+c

   a-b+c=1

   f(0)=1

   f(0)=a*(0)^2 + b*(0) + c=c

   c=1

   f(1)=3

   f(1)=a*(1)^2 + b*(1) + c=a+b+c

   a+b+c=3, but c=1

   a+b+1=3

   a+b=2

   We  have also the expression a-b+c=1 and c=1

   a-b+1=1

   a-b=0

   a=b, but a+b=2=>a+a=2

   2a=2

   a=1

   b=1

   c=1

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   Posted by giorgiana1976 on Thursday April 2, 2009 at 8:17 AM