# Maths help functionnnn

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#1
Can someone help me with this question please I just substituted all of the x for that function but I'm not sure what to do from her e or if its correct
Last edited by Yyyyyyyi; 1 month ago
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1 month ago
#2
Where is the question?
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#3
Where is the question?
I put it now
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1 month ago
#4
You need a common denominator and then simplify the fraction as far as possible.
Last edited by MiladA; 1 month ago
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#5
I'd get a common denominator and simplify the fraction as far as possible.
After the question I put the start of my working out I pit it all into the fraction is that correct
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1 month ago
#6
(Original post by Yyyyyyyi)
After the question I put the start of my working out I pit it all into the fraction is that correct
It is correct, though in the future I'd write the question first so it is clear to you (and the examiner) in case you make a mistake. You should never "do things in your head" or skip steps, however easy it may seem.
Last edited by MiladA; 1 month ago
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#7
It is correct, though in the future I'd write the question first so it is clear to you (and the examiner) in case you make a mistake. You should never "do things in your head" or skip steps, however easy it may be.
I'm trying to answer b and I started by substituting the x's into x/x-2
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1 month ago
#8
(Original post by Yyyyyyyi)
I'm trying to answer b and I started by substituting the x's into x/x-2
I think you mean replace the x's with x/(x-2) as you are applying f to itself. What you have done above is correct.
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#9
I think you mean replace the x's with x/(x-2) as you are applying f to itself. What you have done above is correct.
Yes if I replace the x's I get this I'm not sure what to do after this
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1 month ago
#10
(Original post by Yyyyyyyi)
Yes if I replace the x's I get this I'm not sure what to do after this
Find a common denominator for the expression on the bottom and then simplify using the 'leave, change, flip' rule of fractions i.e. a/b = a x 1/b ('leave' a, 'change' the division sign to a multiplication sign and then take the reciprocal of b ('flip')).
Last edited by MiladA; 1 month ago
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1 month ago
#11
(Original post by Yyyyyyyi)
Yes if I replace the x's I get this I'm not sure what to do after this
Multiply your numerator and denominator by (x - 2)

Post what you get
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#12
(Original post by Muttley79)
Multiply your numerator and denominator by (x - 2)

Post what you get
Multiply The numerator and denominator of the fraction after I have replaced the x's???
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#13
I'm so sorry I'm so dumb 😂😂😂
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1 month ago
#14
(Original post by Yyyyyyyi)
Multiply The numerator and denominator of the fraction after I have replaced the x's???
yes
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1 month ago
#15
(Original post by Yyyyyyyi)
I'm so sorry I'm so dumb 😂😂😂
Yes , what you posted in #9
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#16
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1 month ago
#17
Your numerator is okay but your denominator didn't have to be expanded. When you multiply top and bottom by (x-2), the x-2 on the denominator of x/(x-2) cancels. No need to expand.
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#18
Your numerator is okay but your denominator didn't have to be expanded. When you multiply top and bottom by (x-2), the x-2 on the denominator of x/(x-2) cancels. No need to expand.
so the denominator just becomes x-2?
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1 month ago
#19
(Original post by Yyyyyyyi)
so the denominator just becomes x-2?
We are trying to simplify ...

x/(x - 2) multiplied by (x - 2) is just x

Repeat and repost - make sure you quote so I know you've done this
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