## woohoo one year ago Given the parent functions f(x) = log10 x and g(x) = 5x − 2, what is f(x) • g(x)? @ash2326

1. myininaya

That symbol between f and g means to multiply.

2. woohoo

yes it does

3. myininaya

Ok, do you need anymore help then?

4. woohoo

lol yes I don't get the problem

5. woohoo

How do I do it?

6. myininaya

Take the expression that f is equal to and multiply it to the expression g is equal to.

7. satellite73

i.e. stick a times sign between them, or just write them next to each other

8. woohoo

How do I find out what each expression stands for?

9. myininaya

It is given to you f(x)=log_10(x) and g(x)=5x-2

10. woohoo

Yeah so how do I solve the expression?

11. myininaya

There is really nothing to do here just replace f(x) with what it equals and replace g(x) with what it equals in the expression f(x)*g(x)

12. myininaya

Like if I said f(x)=5x and g(x)=sin(x) then f(x)*g(x)=5x*sin(x)=5xsin(x)

13. woohoo

you lost me

14. myininaya

How about the example, if f(x)=2x and g(x)=e^x then f(x)*g(x)=2x*e^x=2xe^x

15. woohoo

Ok now I'm understanding you more, but i'm getting confused after the = sign.

16. myininaya

Or here is another example if f(x)=4x-2 and g(x)=9x then f(x)*g(x)=(4x-2)(9x) And if you want you could distribute and say f(x)*g(x)=(4x)(9x)-2(9x)=36x^2-18x

17. myininaya

All I'm doing is saying what f(x)*g(x) is given what f(x) equals and g(x) equals

18. myininaya

I'm just replacing f(x) with what it equals and replace g(x) with what it equals

19. woohoo

see I donnt know how to get the equal part

20. myininaya

You put an equal sign

21. myininaya

Or do you mean the part that follows the equal sign

22. woohoo

yes that

23. myininaya

the part that follows the equal sign is f(x)*g(x)

24. woohoo

after the equal part

25. myininaya

just the expressions they are equal to instead of saying f(x)*g(x)

26. myininaya

Like if I said f(x)=3 and g(x)=2 what is f(x)*g(x)?

27. woohoo

6

28. myininaya

yes or you could say 3*2 without simplifying right

29. myininaya

30. woohoo

ok.. I'll be right back.

31. myininaya

|dw:1387336186336:dw|

32. myininaya

then you are done