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Edexcel A2 C3 Mathematics 12th June 2015

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

I'm struggling with this.. :frown:

:frown:

(edited 8 years ago)

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.. :frown:

:frown:

Is it bigger or smaller than the number?
If bigger >=
If smaller <=

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Original post by Andy98

Is it bigger or smaller than the number?
If bigger >=
If smaller <=

Posted from TSR Mobile

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 ?

(edited 8 years ago)

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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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

Is this relevant? Doesn't seem to be in the book..

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

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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Someone pleaseeeeeee helpppp ImageUploadedByStudent Room1433887920.628872.jpg

ImageUploadedByStudent Room1433887920.628872.jpg

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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

Alright, thanks for your replies :smile:

:smile:

Original post by Medicjug

Someone pleaseeeeeee helpppp ImageUploadedByStudent Room1433887920.628872.jpg

ImageUploadedByStudent Room1433887920.628872.jpg

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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

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?

how do you do c) ???

Original post by RK1998

can you show the whole question?

don't know how to find the range in part c) ?

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

Original post by imedico10

is it y is bigger than or equal to 3

yeahh how did you get that? can you explain?

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 :smile:

:smile:

this image shows what im trying to say

image.jpg133.5KB

Why is this the case? Am I missing something obvious?!?!

Original post by Jimmy_M

Why is this the case? Am I missing something obvious?!?!

divde the denominator and numerator by e^0.3t

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 :smile:

:smile:

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