6-7 grade

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6-7 grade

Postby Math Tutor » Sat Dec 03, 2005 3:19 am

If the function f(x) = a.x.x, find out f(4) if f(-4) = 72
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Postby Guest » Sat Jan 14, 2006 2:19 pm

f(x) = a.x^2, and x^2=(-x)^2 for any real x => f(-x)=f(x) => f(-4)=f(4) => f(4) = 72
that's it
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