for f(x) = 1/x^2-3, find
f (3)
f (2+h)

Question

for f(x) =  1/x^2-3, find
f (3)
f (2+h)

anonymous · Answer

For f(3), plug in 3 where the x is.

anonymous · Answer

For f(2+h) your answer will have 1 divided by a quadratic of h in it.

anonymous · Answer

so 1 is 9 and idk 2

anonymous · Answer

2+h just replaces x. It's basically a change in variable

anonymous · Answer

so f = 2+h

anonymous · Answer

is should be in the form$$f(2+h)=\frac{ 1 }{ (2+h)^2 }-3$$

anonymous · Answer

since x is replaced by 2+h

anonymous · Answer

you understand how i did this, right?

anonymous · Answer

oh okay, what about the first one? 9 is correct?

anonymous · Answer

No you have to solve for $$f(3)=\frac{ 1 }{ (3)^2 }-3$$

anonymous · Answer

and whats that? :/

hartnn · Answer

is your f(x) $=\dfrac {1}{x^2-3}$
??

anonymous · Answer

$$f(3)=\frac{ 1 }{ (3)^2 }-3=\frac{ 1 }{ 9 }-3=-\frac{ 26 }{ 9 }$$

anonymous · Answer

so that's the answer? :S

anonymous · Answer

I'm really not good at math sorry!! :/

anonymous · Answer

lol it's really about trying and grasping the topics you learn in school and continuously practicing them. 
No one is born knowing how to completely do math. Everything is practice and applying what  you have learned

But that is the answer