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Mathematics: Post your doubts here!

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23 isn't bearings :|

To find the inverse matrix of
(3 -1)
(-2 2)

1/((3x2)-(-1x2)) *Here*

*This below*
(2_1)
(2_3)

1/4 (2_1)
.......(2_3)
^^^^^^ is the answer

How?

use the formula

1/(ad-bc) . (d..-b)
..................(-c ..a)
Invert the signs of any numbers in position b and c and switch the positions of a and d

Imagine there are no dots.. cant use lots of spaces here..
uggghhhhhhhhhhhhhh...............................IM UTTERLY SORRY
I KNOW MATRIX IWROTE THE WRONG QUESTION NUMBR
but this helped other ppl im sure
 
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Thank you so much :)
But I dont understand, how do we know about x-intercept?, why are we assuming y= 0 ?
Can we always use this method to find the y-intercept ?

Thanks in advance please
 
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Hello, can anyone please give me tips or advice on how to revise for maths paper 2 and 4. I did a lot of practice but seem to get the same mark every time. My major problem is in Transformations ( Rotation, Reflection, Enlargement, Stretch and Shear) and matrices used in transformation. Can someone please help me by posting a good revision book or link? Thanks
guys try these :D
 

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Can someone help me with Q5 part (d) page 195? It's actually from the book "Extended Mathematics for IGCSE by David Rayner".
 
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  • maths Q16.png
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  • maths Q19.png
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  • maths Q22.png
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s09_qp_2.pdf

:(Question 22 part c and d
Question 8 part b:cry:

Question 19 with working:barefoot:
(n)Question 16 is it like we make an angle bisector for th emeeting point or wat?

Question 17 part b an ez way to do reflection wen centre not zero-zero:sick:

I liked how u explained the answer(y)

Ameer Wardi and
drugdealar106 and Bloodserpent

can u plz answer these too

thank u in advance!:cool::D

Q 8)
Capture1.PNG

The above post says it all
 
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Can someone help me with Q5 part (d) page 195? It's actually from the book "Extended Mathematics for IGCSE by David Rayner".
if its the one with the square base pyramid, find slant height, and then using half AB i.e 5 cm find VB or VA. then using cosine rules u can find the angle :3 :D
it is complicated a bit. i'll draw and do it properly in d morning :D
 
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THANKU SHOOO MUCH!!(y)(y)(y)(y)(y)
it did help:)
BUT:confused:in question 16 did u likwmake twoangle bisectors or what!
and ps can u plz post notes for BEaring frm scratch!
Bearings are simple. If they say find the bearing of
A from B
then draw a straight line on B (North line), and then in a clockwise direction go until A
The yellow line is for the above statement

The green angle is the bearing of A from C


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