Qualification > Math
IGCSE MATHS Doubts
Vin:
ans. should be 3 ..
the eqn f(x) + x – 1 = 0 means how many solutions are there for the eqn wen y=0 .. ;)
diva_sparkles:
--- Quote from: mdwael on May 15, 2010, 11:23:54 am ---Hey guys im preparing for P4 maths which to come in a few days and Ive been solving p4 oct/nov and there is a question I dont quite understand and I'd really appreciate your help.
It is question 2 on page 5 (iv) part, its about transformations and tells me to describe triangle U onto triangle X and I know its shear , y axis invariant, but the shear factor is -1, not 1 as I though, can someone please describe me how to know when the shear value is negative? thanks for your help in advance :)
--- End quote ---
it is negative whn the image is toward da left!!
Baladya:
--- Quote from: ~VIN1094~ on May 15, 2010, 12:40:52 pm ---ans. should be 3 ..
the eqn f(x) + x – 1 = 0 means how many solutions are there for the eqn wen y=0 .. ;)
--- End quote ---
Ya but how did you know it was y=0?
mdwael:
--- Quote from: A@di on May 15, 2010, 12:28:51 pm ---w09, paper 4, 2)iv
ok this negative shear factor thingy is horrible..i cant figure it out y the move upwards is considered negative.
anyhow, its always wiser to use the matrix method
take two object and correspoding image co-ordinates..
(-4,1) --> (-4,5)
(-1,1) --> (-1,2)
check the image attached
a shear transformation matrix with y-axis is invariant is = (1 0)
(k 1)
here k = -1
--- End quote ---
Great thanks A LOT i never knew that a matrix gets inversed when its shifted to the other side of the equation
Vin:
u might wanna know this too ..
https://studentforums.biz/index.php/topic,5575.msg167872.html#msg167872
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