Question

HELP NEEDED!

If f(x) = 1 over 3x − 2 and g(x) = −2x − 1, find (f • g)(9)

19

−18

0

−19

If r(x) = 3x − 1 and t(x) = −4x − 1, find (r + t)(7).

9

−9

−49

49

If f(x) = −2x − 4 and g(x) = x + 4, find (f over g)(−8).

−3

3

−1

1

I don't understand how to do these in particular and it would be great if someone could help me with them.

Answer 1

These questions are pretty simple [TRUST ME]

When they have given functions such as
f(x) = Blah blah.... g(x) = blah blah

And when they tell you to calculate
(f.g)(2) = Multiply both functions and put value of 2 in place of x
(f/g)(3) = Divide both functions and put value of 3 in place of x
(f + g)(a) = Add both functions and put value of a in place of x
(f-g)(constant) = Subtract both functions and put value of the constant in place of x.

Understood? :)

Now do the above questions!! :D

Answer 2

famous last words [TRUST ME]

Answer 3

For eg. I'll do the first question and then you do the next 2.

1) f(x) = 1 over 3x − 2 and g(x) = −2x − 1, find (f • g)(9)

(f.g)(x) = \(\frac{1}{3x-2} * {-2x-1}\)

(f.g)(x) = \(\frac{-2x-1}{3x-2}\)

(f.g)(9) = \(\frac{-2(9)-1}{3(9)-2}\)

(f.g)(9) = \(\frac{-19}{25}\)

Understood? :)

Answer 4

keep in mind that \(\bf (r + t)(7) \implies r(7) + t(7)\quad
\textit{and}\quad \cfrac{f}{g}(-8) \implies \cfrac{f(-8)}{g(-8)}\)

Answer 5

[TRUST ME]

LOL @jdoe0001 :D

Answer 6

[read my lips] [I've inhaled the intoxicating fumes from the oracle of Delphi] [ so trust me]

Answer 7

hehe

Answer 8

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