Question

simplify: f(x)=9-xpower2 f(8)= f(-9) f(k)= f(kpower2-7)=

Answer 1

well f(x)=9-x^2 is that written better.
then f(8)=9-8^2=9-64=-55

Answer 2

f(-9)=9-(-9)^2=9-81=-72

Answer 3

I'm a little confused about the f(k) part. could you rewrite it?

Answer 4

f((k^2)- 7 ) = 9 - ((k^2)- 7 )^2
= 9 - ( k^4 -14k^2 +49)
= 9 - k^4 + 14k^2 - 49

Answer 5

gotcha. haha wasn't thinking about that. good teamwork.

Answer 6

:D

Answer 7

f(k)=