Hi im wondering if you can help.

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

If f(1)=6, f(-1)=8 and f(-2)= 18. Find f(2)

Note ^ means power of.

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- Dec 17th 2008, 10:28 AMleavingcertmathsalgebra help please
Hi im wondering if you can help.

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

If f(1)=6, f(-1)=8 and f(-2)= 18. Find f(2)

Note ^ means power of. - Dec 17th 2008, 10:35 AMleavingcertmaths
The answer is f(2)=14. I dont know were the answer comes from, i was thinking simultaneous equations

- Dec 17th 2008, 10:48 AMIsomorphism
- Dec 17th 2008, 10:57 AMleavingcertmaths
- Dec 17th 2008, 09:44 PMIsomorphism
The identity comes from substitution:

f(2) = 4a+2b+c

f(-2) = 4a -2b+c

f(-1) = a - b+c

f(1) = a+b+c