quadratic question.

abbyhart

New member
Joined
Feb 25, 2008
Messages
1
a quadratic function is given by y=a(x-1)squared + k

given two points on the parabola (-1, -11/2) and (1/2, 1/8) find the values of a and k.


-11/2 = a(-1-1) squared + k
-11/2 = 4a +k

1/2 = a(1/8-1)squared + k
1/2 = a (-19/16) + k

-11/2 = 4a + k
1/2 = -19/16 +k
=
-6 = 83a/16 ?
 

Loren

Senior Member
Joined
Aug 28, 2007
Messages
1,299
Looks to me like you interchanged the x and y values of the second point. I think the second equation should be 1/8 = (1/4)a + k.
 
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