Question

What is the value of f[g(3)] for the functions f(x) = x + 3 and g(x) = 2x + 1?

Answer 1

Any help. im so lost

Answer 2

Can you find \(g(3)\)?

Answer 3

I think what you do is substitute 3 in g(x), so g(3) = 2(3) +1 = 7 and then substitute this number in f(g(x)), which would be f(7) = 7+3=10

Answer 4

then how would you find the vlue

Answer 5

or would the value be 10?

Answer 6

so what will my final answer be?

Answer 7

Yes, 10 would be your final answer.

Answer 8

alright thank you

Answer 9

You're welcome!

Answer 10

Did you understand what I did?

Answer 11

yes i did. i just couldnt understandhow to start it

Answer 12

Ok!

Answer 13

can you help with another question tho

Answer 14

Let me see, maybe I can help.

Answer 15

What is the slope of the line through the points (-2, 7) and (3, -3)? m = _?_

Answer 16

Well, the slope is only the change in Y divided by the change in X. So, M= (y2-y1)/(x2-x1)=(3-(-2))/((-3-7)) = 5/-10 = -1/2

Answer 17

oh alright thank you that works it out easier

Answer 18

that makes more sense

Answer 19

and can you help with this problem What is the value of f(6) for the function f(x) = 3x – 5?

Answer 20

Well, they are telling you that for any value of x in the function, you will substitute 6 in it. so that means that f(6) = 3(6)-5=13

Answer 21

oh thaT make so much more sense so my answer is 13 right?

Answer 22

Yes!

Answer 23

then how would you do a problem like this What is the inverse of the equation y = 5x - 1

Answer 24

You'd change the x for the y. You would get X=5y-1 and solve for y. so 5y-x=1
5y=1+x
y=1+x/5

Answer 25

alright i was just making sure thanks

Answer 26

Alright then!