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Mathematics 7 Online
zarkam21:

Need help with this

zarkam21:

1 attachment
zarkam21:

okay so i did the problem and i ended up with \[f(3)=\frac{ 1 }{ 3 }\]

zarkam21:

How do I solve the f(3) part

Vocaloid:

hint: x^2 - 3 = (3^2) - 3 = ?

zarkam21:

oh okay its six

zarkam21:

3

Vocaloid:

good so f(3) = 1/6 = your answer

zarkam21:

i dont do anything with the f(3)?

Vocaloid:

no

Vocaloid:

"f(3)" is just notation that means "the value of f(x) at x = 3" so by evaluating the function at x = 3 you are saying what f(3) is

Vocaloid:

anyway, for part b, you would just replace "x" with "h" and then evaluate what f(h) equals

zarkam21:

um is it 3

Vocaloid:

f(x) = 1/(x^2 - 3) ^ write this down then replace "x" with "h" then that's your answer, you don't need to do anything else

zarkam21:

so

zarkam21:

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

Vocaloid:

yep that's it

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