Mathematics: Post your doubts here!

[whitecorp]

Guys which answer is correct???View attachment 17451View attachment 17452View attachment 17453

Both are wrong. Peace.

 

[junyl93]

The full solutions for this vectors problem here:



Hope it helps. Peace.

Excuse me sir, but for (iii), how do u know point A is (5,0,0) ?? Why AB times (unit vector 2,-2,1) ??? Why use unit vector? Please do tell me.

 

[whitecorp]

Excuse me sir, but for (iii), how do u know point A is (5,0,0) ?? Why AB times (unit vector 2,-2,1) ??? Why use unit vector? Please do tell me.

Because the scalar product of (5, 0, 0) and the normal to the plane (2, -2, -1) equals 10, hence the point (5, 0, 0) lies on the plane. You can always choose another point if you want to, so long as the scalar product of that point and the normal to the plane equals 10. For example you could use ( 0, -5, 0).

With regards to AB dot unit vector of ( 2,-2,1), this uses the concept of projection vectors, and in this instance, the projection of the vector AB onto the normal of the plane.

Hope this helps. Peace.

 

[bamteck]

ln(1+y²) =2 x + 1/ln5

1+y²= e^ (2 x + 1/ln5)

y²= e^ (2 x + 1/ln5) -1 (shown)

Hope this helps. Peace.

Why the marking scheme quote the answer as : y² = 5 e2x - 1 ?

 

[shanky631]

Plz help guys.
whitecorp
parthrocks
leadingguy

 

[junyl93]

With regards to AB dot unit vector of ( 2,-2,1), this uses the concept of projection vectors, and in this instance, the projection of the vector AB onto the normal of the plane.

Hope this helps. Peace.[/quote]


Okay....i kinda get it now about the projection stuff. Thanks alot sir. If u have time, can u help me with ques 10(iii) and 6(i). Here

 

[RockyBo1234]

U mean the term "non-zero"?

ya!

 

[RockyBo1234]

help someone

 

[momo_khan]

white corp can you kindly solve the vectors question from may june 2012 paper 32 .

 

[Kirabo Takirambudde]

View attachment 17341


Does anybody have the workings to (bii) of this question???

 

[Mattman]

Guys, http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w08_qp_3.pdf


number 10 please.

 

[Kirabo Takirambudde]

Guys, http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w08_qp_3.pdf


number 10 please.

which part??

 

[xyz!]

can sum1 help me wid the q.10)b)ii) pls ??

 

[xyz!]

Q.8)ii) pls!

 

[xyz!]

whitecorp sir pls help me out with q.6)ii) and also with 2 doubts dat i hav posted above...pls!

 

[Riya]

Can anyone help me wid qstn no 10, pls!??
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_33.pdf

 

[shanky631]

Plz help me out whitecorp

 

[parthrocks]

Plz help me out whitecorp
View attachment 17480

Hey bro is this the question that i was solving which you had clarified with miss!

 

[shanky631]

B

Hey bro is this the question that i was solving which you had clarified with miss!

Why did u only shade a part of the region?? Whole circle will be shaded.

 

[shanky631]

Hey bro is this the question that i was solving which you had clarified with miss!