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IGCSE MATHS Doubts

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Shazizzzle:
11 AM - 12:30 PM :)

6394:
m j 09 q22 plzzzz ??? ??? ???

the_grim_reaper:
Guys has someone already answered question 9 oct/nov 07 paper 2 ??? Please I don't know how to do it! :(

Shazizzzle:

--- Quote from: deadman786 on May 11, 2010, 10:04:37 pm ---Guys has someone already answered question 9 oct/nov 07 paper 2 ??? Please I don't know how to do it! :(

--- End quote ---
Mullay.

x^2 + 4x - 8
= x(x +4) -8
=x(x + 4 + (4/2)^2 - (4/2)^2) - 8  [Completing square method applied]
=x(x + 4 + (2)^2) -(2)^2 -8
=x(x + 2)^2 -4 -8
=x(x + 2)^2 - 12

So, (x + p)^2 + q
Therefore, p=2, q=-12.

:)

the_grim_reaper:
Shaz 1 final thing say if I take the coefficient of x to 5, then it'll p=2.5 and q= -14.25 right????

By the way, SAR right guess ;D.

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