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Edexcel A2 C3 Mathematics 12th June 2015 watch

1. Can someone explain how you know when to put <= or >= in a finding the range/ domain question?

I'm struggling with this..
2. (Original post by ridirahman)
Can someone explain how you know when to put <= or >= in a finding the range/ domain question?

I'm struggling with this..
Is it bigger or smaller than the number?
If bigger >=
If smaller <=

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3. (Original post by Andy98)
Is it bigger or smaller than the number?
If bigger >=
If smaller <=

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So for example; The function g is defined by g x^2 – 4x + 11,
(b) Find the range of g.

I got y=7 so how do you know if it's y>= 7 or y<=7 ?
4. (Original post by ridirahman)
So for example; The function g is defined by g x^2 – 4x + 11,
(b) Find the range of g.

I got y=7 so how do you know if it's y>= 7 or y<=7 ?
Is that a minimum or maximum?

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5. (Original post by ridirahman)
So for example; The function g is defined by g x^2 – 4x + 11,
(b) Find the range of g.

I got y=7 so how do you know if it's y>= 7 or y<=7 ?
Draw the function by completing the square - once you have draw in you will know but it has to be bigger than 7 if the x^2 is positive... I think
6. Is this relevant? Doesn't seem to be in the book..

7. (Original post by Jimmy_M)
Is this relevant? Doesn't seem to be in the book..

I think this is part of a further core module so I would presume not
8. (Original post by Jimmy_M)
Is this relevant? Doesn't seem to be in the book..

I know OCR don't test it, but it's helpful to have a rough understanding that sometimes the iterative formula won't converge

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10. (Original post by Andy98)
I know OCR don't test it, but it's helpful to have a rough understanding that sometimes the iterative formula won't converge

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(Original post by Artfanatic)
I think this is part of a further core module so I would presume not
11. (Original post by Medicjug)

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the first part r= sqrt(1^2+sqrt3^2)
and a tan^-1 (sqrt3/1)
i think
and i would be ****ed if b came up in the exam
12. (Original post by RK1998)
Any tips for trig factor formulae?I can't do any questions involving those. The rest of trig is good but this is just. Please someone help me.
Help?

13. how do you do c) ???
14. (Original post by RK1998)
can you show the whole question?

don't know how to find the range in part c) ?
15. (Original post by ridirahman)

don't know how to find the range in part c) ?
is it y is bigger than or equal to 3
16. (Original post by imedico10)
is it y is bigger than or equal to 3
yeahh how did you get that? can you explain?
17. (Original post by ridirahman)
yeahh how did you get that? can you explain?
i'll try my best... according to f(x) x must be bigger than zero.

the graph for fg is 3e^x +x^2 ..... is you sub x=0 you get y as 3.... after 3... y keeps increasing exponentially so the range (values of y) is bigger than 3. hope this helps

this image shows what im trying to say
Attached Images

18. Why is this the case? Am I missing something obvious?!?!
19. (Original post by Jimmy_M)

Why is this the case? Am I missing something obvious?!?!
divde the denominator and numerator by e^0.3t
20. (Original post by imedico10)
divde the denominator and numerator by e^0.3t
Oh.. So i was just being an idiot really... LOL thanks for the help

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