Qualification > Math
IGCSE MATHS Doubts
Fastal:
--- Quote from: ksitna on May 08, 2010, 05:31:41 pm ---uh im sorry
i dont really get it
how did u get -7?
--- End quote ---
i think its +9
@d!_†oX!©:
--- Quote from: ksitna on May 08, 2010, 05:31:41 pm ---uh im sorry
i dont really get it
how did u get -7?
--- End quote ---
see, first u substracct and then take the lcm
it is
+9-16 which is equal to -7
(x-3)/4 - 4/(x-3) = 0
then take lcm
so,
(x-3)(x-3) - 4*4 / 4x - 12 = 0
x2 -3x -3x +9 -16 / 4x-12 = 0
so the simplify and get
x2 - 6x -7 / 4x -12 = 0
Vin:
--- Quote from: ksitna on May 08, 2010, 05:31:41 pm ---uh im sorry
i dont really get it
how did u get -7?
--- End quote ---
(x-3) (x-3) - 16
------------------
4x -12
x2 -6x + 9 - 16
------------------
4x -12
x2 - 6x -7
------------------
4x -12
Vin:
Ok guys i hav a doubt .. after a long time .. :P
ksitna:
--- Quote from: @d!_†oX!© on May 08, 2010, 05:39:35 pm ---see, first u substracct and then take the lcm
it is
+9-16 which is equal to -7
(x-3)/4 - 4/(x-3) = 0
then take lcm
so,
(x-3)(x-3) - 4*4 / 4x - 12 = 0
x2 -3x -3x +9 -16 / 4x-12 = 0
so the simplify and get
x2 - 6x -7 / 4x -12 = 0
--- End quote ---
the mark scheme says
x2-6x+25/4(x-3) :/
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