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# Maths: Functions watch

1. Hi I'm doing a maths past paper but I'm really struggling with a question, I'd really appreciate anyone's help. Thanks

17. f=3/(x+1) + 1/(x-2)

a) State one value of x which cannot be included in any domain of f.
b) Find the value of f(0) - (think I've done that one though)
c) Find the value of x for which f(x) =0. Show clear algebraic working.

If you answer them please could you put the working out so I know how to do it in the future? Thank you!
2. (Original post by Lennie14!)
Hi I'm doing a maths past paper but I'm really struggling with a question, I'd really appreciate anyone's help. Thanks

17. f=3/(x+1) + 1/(x-2)

a) State one value of x which cannot be included in any domain of f.
b) Find the value of f(0) - (think I've done that one though)
c) Find the value of x for which f(x) =0. Show clear algebraic working.

If you answer them please could you put the working out so I know how to do it in the future? Thank you!
For A the only thing i can think of is this,
remember that any number/0 can't work? Well that can apply here.
Spoiler:
Show
1 to make the first fraction have a total of 0 on the bottom OR 2 to make the second fraction 0 on the bottom

For C put f= to 0 then cross multiply and solve like a normal algebraic problem
Spoiler:
Show
3/(x+1) + 1/(x-2)=0
3(x-2) + x+1=0
3x-6+x+1=0
4x-5=0
4x=5
x=5/4 or 1.25 or 1¼
3. thanks

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