Math Is Fun Forum

Hi;

You need another variable. Are we talking about x = y - 2 / 4 ?

Hi

For g and g... I get (x+8)+8. In this situation, would you have to multiply both 8's or add them

You did the composition correctly, now you add the eights.

For the second question:

3x+ 2 is not the same as 3(x+2). 3(x+2) means multiply everything in the parentheses by 3. So you get:

3x + 3(2) = 3x + 6

Can you do another one?

Now use some algebra to clean that up a little.

f(x+1) = x+1 + 4

Simplifying often just means combining things together. Well the 1 + 4 is 5 so that means we can simplify that to.

f(x+1) = x+5

We are done!

Hi;

Hold it, watch what I am doing.

f(g(x)) = g(x) + 4

See the boldfaced g(x) in the above equation?

Hi;

You skipped a step.

f(x) = x + 4

Now putting a g(x) wherever we have a x in f(x) we get:

f(g(x)) = g(x) + 4

Okay, I will put another one down and you do it for me:

What is?

Hi;

f(x)=2x+3

g(x) = x+3

This just means:

So for every x in f(x) we substitue a g(x)

Follow up to here?

Okay, what problems are you working on, I forgot.

Hi;

You would first minus 6 from both sides and then divide by 4 to both sides.

It is time to sleep for a couple of hours, I am really tired. I will see you later and help with the compositions if no one else has

x/ 4 is the same as x * ( 1 / 4 ). The fours cancel in either case and just leave the x.

Now we swap the x to the other side.