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[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !

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Dibss:
^ +Rep (:

Arthur Bon Zavi:

--- Quote from: Whisper on December 27, 2010, 07:38:52 pm ---^ +Rep (:

--- End quote ---

Anytime. ;D

Vampire-Love4ever:

--- Quote from: Dhirubhai Ambani on December 27, 2010, 03:00:50 pm ---I do all these by a simple method, and if you don't understand, use the formula given in the book :
ax2 + bx + c = a ( x2 + b    )
                             (         ---x )
                             (          a    )

x2 + bx + c = (x2 + bx) + c = {(x + 1/2 b)2 - 1/4 b2} + c

(1)

 -x2 - 2x - 3
-(x2 + 2x - 3)
-(x2 + 2x + 1 - 4)
-(x + 1)2 + 4           ---------> a = 4; b = -1; maximum value = 4.

(2)

x2 + 4x
(x2 + 4x)
(x2 + 4x + 4 - 4)
(x + 2)2 - 4             ----------> a= -4; b= -2

(3)

2x2 - 6x
2 (x2 - 3x)
2 (x2 - 3x + 2.25 - 2.25)
2 (x - 1.5)2 - 4.5                ------------> a= 2; b= 1.5; c= -4.5

--- End quote ---



Thanks!:) [rep]

acash09:
I have a problem here:

Question 4 --> P1 M/J 2009 (CIE AS-LEVEL) (9709/01/M/J/09)

I need explanation on how to exactly solve this question. Help is very much appreciated.
My friend told me its about amplitude and wavelength etc.

Thanks in advance.
Acash09

Dibss:
Please post the question or attach the paper. Thanks :)

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