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# Can this question come up on Edexcel GCSE Mathematics A?

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1. Hey,

Can this type of exponential graph question come up on Edexcel GCSE Maths A?
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2. (Original post by phat-chewbacca)
Hey,

Can this type of exponential graph question come up on Edexcel GCSE Maths A?
Unlikely but it has i think???
3. (Original post by phat-chewbacca)
Hey,

Can this type of exponential graph question come up on Edexcel GCSE Maths A?
not in the old gcse but in the new (1-9) yes
4. (Original post by Big Moisty)
Unlikely but it has i think???
Ahh, I really want it to come up tho!
5. (Original post by phat-chewbacca)
Ahh, I really want it to come up tho!
Because you know how to do it? ^-^
6. (Original post by phat-chewbacca)
Hey,

Can this type of exponential graph question come up on Edexcel GCSE Maths A?
could you show the working out if you know the answer
7. That definitely won't come up
8. (Original post by theBranicAc)
could you show the working out if you know the answer
You just take the log of both sides, rearrange, and use simultaneous equations
9. (Original post by theBranicAc)
could you show the working out if you know the answer
substituting values from the graph into the equation:
5 = p*q
320 = p*q^4

If you multiply the first equation by q^3 you will get the second equation.
Therefore, 320/5 = q^3
q^3 = 64

the cubed root of 64 is 4, so q = 4.

substituting this back into the first equation:

5 = p * 4
p = 1.25

You can then check these values with the second equation to make sure
10. (Original post by surina16)
substituting values from the graph into the equation:
5 = p*q
320 = p*q^4

If you multiply the first equation by q^3 you will get the second equation.
Therefore, 320/5 = q^3
q^3 = 64

the cubed root of 64 is 4, so q = 4.

substituting this back into the first equation:

5 = p * 4
p = 1.25

You can then check these values with the second equation to make sure
oh okay I understand, could you help me with this please?
http://www.thestudentroom.co.uk/show...5#post64727205

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