# A-Level Maths Functions

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Thread starter 1 month ago
#1
Can anyone help explain what this question means and how to do the first couple so I know what I'm meant to do?
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1 month ago
#2
(Original post by Meggggggggggg)
Can anyone help explain what this question means and how to do the first couple so I know what I'm meant to do?
Chain two or more functions together so the output of one is the input to another.

For the second one, which functions might be useful?
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Thread starter 1 month ago
#3
(Original post by mqb2766)
Chain two or more functions together so the output of one is the input to another.

For the second one, which functions might be useful?
oh ok, so for example jg(x) would be 4sqrtx? How would you then divide it by 2 to get part ii)?
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1 month ago
#4
(Original post by Meggggggggggg)
oh ok, so for example jg(x) would be 4sqrtx? How would you then divide it by 2 to get part ii)?
Close with jg(x), but think about the order. How can a 4 become 2? Not just by dividing by 2.
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Thread starter 1 month ago
#5
(Original post by mqb2766)
Close with jg(x), but think about the order. How can a 4 become 2? Not just by dividing by 2.
gj(x)? would that then be sqrt4x which is the same as sqrt4sqrtx which is 2sqrtx??
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1 month ago
#6
(Original post by Meggggggggggg)
gj(x)? would that then be sqrt4x which is the same as sqrt4sqrtx which is 2sqrtx??
Yes. That's the sort of thinking about elementary functions and how they're chained together they want you to do.
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Thread starter 1 month ago
#7
(Original post by mqb2766)
Yes. That's the sort of thinking about elementary functions and how they're chained together they want you to do.
ok thanks! however i'm still confused about part iii), when there's indices involved i get confused.
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1 month ago
#8
(Original post by Meggggggggggg)
ok thanks! however i'm still confused about part iii), when there's indices involved i get confused.
So what does a +1 in the index represent. Which elementary functions may be useful?
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