Maths AQA C1 revision - 14th January 2013

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Yeah I put [3 2] but not sure what about the factor theoren question??Its easy but for some reason i completely blanked out. Man I hate Maths! Aiming for a B.

i got the one of them was a factor (x+1) i think

then for the remainder question, i THINK i got the remainder was 12....or it might have been 16... can't remember :/

Reply 141

Ferrari_1996

Original post by Taran Hare

Yeah I put [3 2] but not sure what about the factor theoren question??Its easy but for some reason i completely blanked out. Man I hate Maths! Aiming for a B.

I didn't know what the third factor was when it asked you to express p(x) as a product of 3 factors. Does anybody know what the third factor was and how did you work it out? Thanks in advance if you answer my question.

(edited 11 years ago)

Reply 142

nursy96

Original post by Ferrari_1996

Did anybody else get 5 as the radius for the circle?

yeah i got that r=5

Reply 143

the_googly

Original post by Ferrari_1996

Did anybody else get 5 as the radius for the circle?

yes

Reply 144

Fillly

Would anyone hazard a guess as to what the A grade boundary would be?

Reply 145

nursy96

Original post by Ferrari_1996

I didn't know what the third factor was when it asked you to express p(x) as a product of 3 factors. Does anybody know what the third factor was and how did you work it out? Many thanks in advance.

i got that there was a repeated root of (x-3) so when you were asked to draw the graph the curve touched the x-axis at 3

Reply 146

Segadfx

Original post by Ferrari_1996

I didn't know what the third factor was when it asked you to express p(x) as a product of 3 factors. Does anybody know what the third factor was and how did you work it out? Many thanks in advance.

The product of p(x) as linear factors was:

(x+1)(x-3)^2 if I remember correctly.

To work them out I just used the factor theorem, ie. if x-3 was a factor, p(3) would = 0.

Reply 147

Ferrari_1996

Original post by nursy96

yeah i got that r=5

Good. It was root25 wasn't it?

Reply 148

zakir123

Original post by Ferrari_1996

(x-3)(x-3)(x+2)

Reply 149

Ferrari_1996

Original post by nursy96

i got that there was a repeated root of (x-3) so when you were asked to draw the graph the curve touched the x-axis at 3

How do you know that there was a repeated root of (x-3)?

Reply 150

nursy96

Original post by Ferrari_1996

Good. It was root25 wasn't it?

yep

Reply 151

the_googly

Original post by Ferrari_1996

Good. It was root25 wasn't it?

Same thing

Reply 152

Ferrari_1996

Original post by zakir123

(x-3)(x-3)(x+2)

Ok thanks but how do you know if there are two factors that are the same? Is it because, if the three numbers are multiplied together, they must equal 18?

Reply 153

Taran Hare

Original post by SherlockHolmes

I remember my answer was 2/7. The fraction given in the question had root18 and root32 somewhere in the question.

2root2 divided by root18+root32 I think.

crap i forgot to simpify it further to get 2/7. I.always do something like thus in maths!

Reply 154

nursy96

Original post by Ferrari_1996

How do you know that there was a repeated root of (x-3)?

because you knew (x-3) was a factor from a previous question, when you did long division you got (x2-x-6) and the two factors from that were (x+2)(x-3) so there was a repeated root of (x-3)

Reply 155

zakir123

Original post by Fillly

Would anyone hazard a guess as to what the A grade boundary would be?

maybe 60 as normal 80% cuz fairly a decent paper 52 for a B 44 for a C
these are however by perecentages cud change depending on everyone else but majority found it quite easy so ill asume aqa will stick to their guns and do the grade boundaries as they should be

Reply 156

Ferrari_1996

Original post by nursy96

because you knew (x-3) was a factor from a previous question, when you did long division you got (x2-x-6) and the two factors from that were (x+2)(x-3) so there was a repeated root of (x-3)

I used the factor theorem instead of long division. Weren't you supposed to use the factor theorem instead of long division?

Reply 157

Rishi_Sood11

How many marks do people think you could drop to get an A?

Reply 158

zakir123

Original post by Ferrari_1996

Ok thanks but how do you know if there are two factors that are the same? Is it because, if the three numbers are multiplied together, they must equal 18?

yes you can mutliply it out which i did in the exam and came out to the correct equation also wen drawring the graph the curve on intrests the x axis 1 and touches it at 3 then shoots off

Reply 159

nursy96

Original post by Ferrari_1996

I used the factor theorem instead of long division. Weren't you supposed to use the factor theorem instead of long division?

i think you can do both but long division along with the previous factor shows the three linear factors required in the question, its just quicker than using the factor theorem most of the time