Question

If f(x) = 2x + 3 and g(x) = 4x – 5, what is f(x) ◦ g(x)?

a. 18x + 3
b. 8x – 7
c. 8x – 15
d. 8x + 7

Answer 1

\(\Large \color{purple}{\rightarrow (2x + 3)(4x - 5) }\)
\(\Large \color{purple}{\rightarrow 2x(4x - 5) + 3(4x - 5) }\)

Solve now?

Answer 2

yes i ddi FoIL and got a werid answer...

Answer 3

8x - 10x + 12x - 15

Answer 4

Let me check it:

\(\Large \color{Midnightblue}{\rightarrow 8x^2 - 10x + 12x - 15 }\)
\(\Large \color{Midnightblue}{\rightarrow 8x^2 + 2x - 15 }\)

Answer 5

but thats what i got and taht is none of the choice/...

Answer 6

Hmm :/

Answer 7

@lgbasallote @inkyvoyd

Answer 8

no...
actually, it is like this...
\[f(x).g(x)=f(g(x))\]
\[=f(4x-5)=2(4x-5)+3\]
now, try solve this...

Answer 9

oh i get it so its 8x - 10 + 3 = 8x - 7

Answer 10

Yes!

Answer 11

yes, correct...=)

Answer 12

tahnk u!

Answer 13

you are welcome...=)