# homework help

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What is f(x) − f(x + 2) if f(x + 1) = x(x + 2)?

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Still no working or acknowledgement of the hints I gave you yesterday?

Edited by studiot

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1 hour ago, anum said:

What is f(x) − f(x + 2) if f(x + 1) = x(x + 2)?

It is an equation

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It is an equation. You just need to manipulate the values and you can get your answer.

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If you let u= x+ 1, x= u- 1 and x+ 2= u+ 1.  So what is f(u)?  What is f(x) for any x?

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f(x+1)= x(x+2) ---> f(x+1)= (x+1-1).(x+1+1)   ----> f(x)=(x-1).(x+1)    and  f(x+2)= (x+2-1).(x+2+1)=(x+1).(x+3)

f(x)-f(x+2)= x2-1 - x2+4x+3= 4x+2

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inverse, This section is homework help, not homework answers.

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I don't agree  with answer. I think  'inverse'  forgot to change sign...

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On 10/19/2017 at 8:53 AM, HallsofIvy said:

So what is f(u)?

Woah I was reading over this post and thought I saw it get a little intense here but then I realized you were actually helping! haha Ill just keep reading quietly in the background

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