Question

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

Answer 1

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

Answer 2

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

Answer 3

so 1 is 9 and idk 2

Answer 4

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

Answer 5

so f = 2+h

Answer 6

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

Answer 7

since x is replaced by 2+h

Answer 8

you understand how i did this, right?

Answer 9

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

Answer 10

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

Answer 11

and whats that? :/

Answer 12

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

Answer 13

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

Answer 14

so that's the answer? :S

Answer 15

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

Answer 16

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