C1 and C2 DOUBTS HERE!!!!!

[MasterMath]

@The Mysterious Dude .. you did a small mistake up there .. np = -30

so you'll get n= 10 as you said but p=-3



I can help any1 if needed

[Khey [Rainbow]]

this is not a ppq..this was given by my teacher
its alryt if u cant solve it

[Ghost Of Highbury]

okay, i can help in a)i) part

for AB to be perpendicular to BC, the product of their gradients shud be -1

lets try, 'm' of AB = (9-3)/(5-1) = 6/4 = 3/2

           'm' of BC = (7-9)(8-5) = -2/3

3/2 * -2/3 = -1

hence proved.

a)ii) first find the co-ordinates of M i.e ((8+1)/2, (7+3)/2) = (4.5,5)

length of BM = = = = 4.03

length of CM= = =  = 4.03

b) Eqn of a circle = (x-h)^2 + (y-k)^2 = r^2
 
h,k = co-ordinates of the center of the circle, here of M

h = 4.5
k = 5
r = 4.03

(x-4.5)^2 + (y-5)^2 = 16.25

Hence proved
@Dude - SOrry i cudnt help much, i used my add. math knowledge to solve this for him. U have a lotta Qs to solve..

@Khey, MasterMath - Did u check this answer? If any errors, plz tell me, i tried solving it.

[Khey [Rainbow]]

yah its right!

[Saladin]

Daym, forgot the minus sign.

[Saladin]

yah its right!

can u chek if mine is rite???

[MasterMath]

And for part b for the bank question the formula is

The G.P Sqnce is : P + P(1+r%) + P(1+r%)^2 ...P(1+r%)^n-1
Thats the sqnce for n years ...

We know that the sum for any G.P is a1((1-(r)^n)/1-r) Where r is the common ratio or w.e

so it becomes 400((1-(1+r%)^12)/1-(1+r%))
Giving you 9364.563977


For the triangle question

Part a was explained correctly .. you do the slope product = -1

For part b

You use distance fromula to find distance between BM and MC .. Given that M is the midpt so you use midpt formula which is A_x+C_x /2 same for y .. Gives you that point M is 4.5,5

So the distance between B and M is Radical 65 / 2 .. radical for 65 only

you show you get the same answer for applying it for between BM and MC ..

And now part C ..

They want the circle that passes through all of them .. It makes sense that M should be the center cause BM = MC = AM .. (remember M is the midpt of AC and you just proved BM = MC )

So the formula of the circle becomes : (x-4.5)²+(y-5)²= Part b answer ^2  ( equal to 65/4)

Simply done

[Saladin]

Hvnt done this stuff for a long time.

[MasterMath]

Anything else ?

[Khey [Rainbow]]

lol..thanks alot for sparing ur tym wid me
nothin else..=D

[MasterMath]

Ill be answering any questions before friday .. since i have my schools exam on saturday =_="

[halosh92]

for paper L these are the questions:
-q2

for paper K these are the questions:
q4
q5a
q7
thxx aloot

[halosh92]

could someone explain this:
The circle C, with centre (a, b) and radius 5, touches the x-axis at (4, 0)

(a)   Write down the value of a and the value of b

[T.Q]

could someone explain this:
The circle C, with centre (a, b) and radius 5, touches the x-axis at (4, 0)

(a)   Write down the value of a and the value of b

solve simultaneously

first equ. distance between the two points = radius

second equ.  equation of the circle

then substitute   

[halosh92]

solve simultaneously

first equ. distance between the two points = radius

second equ.  equation of the circle

then substitute   

could u just type the equations for me
am rili sorry