Qualification > Math

GUYS ANY TOUGH P1 QUESTIONS

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cashem'up:
hey guys got my P1 exam tomrow...... done all the papers... now feel useless doin nodin...... if any one has come across  ne tricky mind boggling question please tell me....lol....can be from txt book net....newhere( by da way use cie p1 book) Thanks
 ;D ;D ;D

thecandydoll:
cie p1 txtbook/
PG 287
question 9 b 2.

tmisterr:
(i)dy/dx= 3x2-6x+12

(ii) completed the square form is 3(x-1)2+9 and this is the gradient function so it will be least when the bracketed part is equal to 0 (when x = 1) and when this is so, gradient is 9.

joel:
May June 2008 Question 8

tmisterr:
fg(x)=4(9/2-x)-2k

36/(2-x)-2k=x

36-2k(2-x)=2x-x2

x2-2x+2kx+36-4k

two equal roots so b2=4ac

(-2+2k)2=4*1*(36-4k)

4-8k+4k2=144-16k

4k2+8k-140=0

simplify(divide both sides by 4)

k2+2k-35=0

(k+7)(k-5)=0

k=-7 of k=5

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