Mathematics: Post your doubts here!

[always-smile :)]

Thanks always smile.

I have some other doubt. How to answer question 6 b) iii:
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w09_qp_4.pdf

no need
------
when you solved the equation f(x)=g(x) you get the intersection point then make those 2 values in an inequality so that x is between them 2
((( -4.5<x<1.4 ))) ---> check it ( in the area between the 2 values g(x) is greater than f(x)
the intersection points are the limits of the relation between the 2 equation
hope u got it

 

[always-smile :)]

oh ok....my bad

soo my calculator went crazy 2 or what

 

[Yousif Mukkhtar]

no need
------
when you solved the equation f(x)=g(x) you get the intersection point then make those 2 values in an inequality so that x is between them 2
((( -4.5<x<1.4 ))) ---> check it ( in the area between the 2 values g(x) is greater than f(x)
the intersection points are the limits of the relation between the 2 equation
hope u got it

Yes, I got it. Thanks.

 

[Yousif Mukkhtar]

soo my calculator went crazy 2 or what

A calculator doesn't ever make a mistake. There is a trick to use the cosine rule using a calculator:

To find a side we use this method:
The formula which you need is a2= b2+c2-2bc x cos A
In your calculator do it part by part.

Like first b2+ c2.
Then do - (2 x b x c x cos A)
Then at last do a square root to the answer you got.

The trick is just to do it part by part.

 

[kboss]

soo my calculator went crazy 2 or what

which question r u doing??
maybe i could help.?

 

[always-smile :)]

which question r u doing??
maybe i could help.?

ok look at w09 Q 5 a-iv (( the answer i found is 31.4))

 

[always-smile :)]

A calculator doesn't ever make a mistake. There is a trick to use the cosine rule using a calculator:

To find a side we use this method:
The formula which you need is a2= b2+c2-2bc x cos A
In your calculator do it part by part.

Like first b2+ c2.
Then do - (2 x b x c x cos A)
Then at last do a square root to the answer you got.

The trick is just to do it part by part.

i do this but the same error happens ..... the answers ARE NOT THE SAMEEEE

 

[always-smile :)]

Yes, I got it. Thanks.

NO NEED

 

[Lost_Life]

guess HOW do we answer page 17 b ?? mj 2010
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_42.pdf

 

[Iridescent]

where do v get the 82 from ?

100%-18%=82%

 

[Yousif Mukkhtar]

NO NEED

I answered this today! I forgot about that. See:
Let <DBA= y
x+3 can be considered as the opposite. So 4+3=7
And 2x+5 is the adjacent. So 2 x 4+ 5=13
Remember: We got x value before

Now, if you can notice Triangle DAB can be a right angled triangle. So use the tan rule.
1. tan y=opp/adj
2. tan y= 7/13
3. y= tan^-1 x (7/13)
4. You now get 28.3

 

[always-smile :)]

guess HOW do we answer page 17 b ?? mj 2010
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_42.pdf

B-I ) POS is iso. triangle so <O= 180 - (42 x 2 )= 96
ii) <R = 1/2 <O so 96/2 = 48
iii) <Q = <R suspended the same arc and <S = 35 so 35 +48 = 97
iv ) <S = 35

 

[david432122]

did any one finish paper 3 or 4

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

guess HOW do we answer page 17 b ?? mj 2010
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_42.pdf

Assalam-o-alaikum wr wb..
(i) POS=180-42-42=96 (OPS and OSP will be equal as it is an isosceles triangle (radius))
(ii) PRS will be half of POS i.e 96/2=48
(iii) SPQ=180-(35+48) (cuz it is a cyclic quadrilateral and opposite angles add upto 180)
(iv) PSQ=PRQ=35 (angle on the same arc)

hope it helps

 

[always-smile :)]

I answered this today! I forgot about that. See:
Let <DBA= y
x+3 can be considered as the opposite. So 4+3=7
And 2x+5 is the adjacent. So 2 x 4+ 5=13
Remember: We got x value before

Now, if you can notice Triangle DAB can be a right angled triangle. So use the tan rule.
1. tan y=opp/adj
2. tan y= 7/13
3. y= tan^-1 x (7/13)
4. You now get 28.3

NOOOO MY CALCULATOR GAVE ME 31.4

 

[always-smile :)]

did any one finish paper 3 or 4

WE don't take paper 3 we are extended only paper 2 and 4

 

[Yousif Mukkhtar]

NOOOO MY CALCULATOR GAVE ME 31.4

I think then there is something wrong with it. Are you using an fx calculator?

 

[always-smile :)]

I think then there is something wrong with it. Are you using an fx calculator?

yup fx-991ES
so WHAT CAN I DO NOOOOW

 

[Yousif Mukkhtar]

yup fx-991ES
so WHAT CAN I DO NOOOOW

Can you restart it?

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

yup fx-991ES
so WHAT CAN I DO NOOOOW

aoa wr wb..
may i know what's the problem?