Question

Can someone explain to mee how to do this problem? Look below.

Answer 1

hi,
when u have to find f(2) u must substitutes 2 in places of x instead of x in f(x)
i.e. - if f(x) = x^2 + 2x then f(2) = 2^2 +(2*2)
Use that method for the first one ..... Then wt will be the value of f(2) ?

Answer 2

Did u get it ?

Answer 3

so far i get it

Answer 4

So would f be four? because 2*2?

Answer 5

"So would f be four? because 2*2?"
Could u be more specific pls .. r u talking about my example or ur problem ?

Answer 6

this f(2)

Answer 7

hmmmm..... I still didn't get it.
but any way I'll explain to u again
f(x) = 3x -4
now the question asks for the f(2)

So u must substitute 2 instead of x in f(x) ....
f(x) contain only one term which include x - i.e "3x"
now substitute 2 instead of x in "3x"

and u will get a expression like this
3x -4 -----> (3*2) - 4 = 2
yep! , that's the value of f(2) ..... Did u get it now ?

Answer 8

Yes. thank you!

Answer 9

Now for the second one I think u should not have any troubles in finding f(1/3) cause it's the same procedure as finding f(2)
Wt trick is finding g(-2)....
The basic to find g(-2) is the same as finding f(2) . U have to substitute -2 instead of x in in g(x) and it will give u something like this
\[\left| -2 \right| + 3\]
here the two brackets between -2 sign is used to indicate that no matter wt the number inside that bracket (ether positive or negative) is we will only consider the positive value of it.
i.e - if there was
\[\left| -5 \right|\] we will consider 5 instead of -5

So in the same way -2 in g(-2) will become 2 , which would give us a expression like this
g(-2) = 2 +3 = 5
r u fine with that... So we could move to the third one ?