Additional Mathematics (0606) Doubt

[XxChampXx]

Can anyone help me out in this question?View attachment 54971

First expand (a+3√ 5)^2:- a^2+6a√ 5+45

Now the equation is:- a^2+6a√ 5+45+a-b√ 5=51
Taking √ 5 common:- a^2+a+45+(6a-b)√ 5=51

Now, we have to equate the integers on the left and right side:- a^2+a+45=51
Now, we have to equate the √ 5 coefficients on both sides:- 6a-b=0(It is equal to zero because there are no √ 5 coefficients on the right hand side)
(Note:-only equate the √5 coefficients after you have taken common, it is less likely that you will make errors)

Now solve the simultaneous equations
a^2+a+45=51----->1
6a-b=0----->2

a=2 or a=-3
b=12 or b=--18

 

[XxChampXx]

Common it's obvious no restrictions so why do separately, it's obviously 14C8
And just calm down its only a two mark question.

For the permutations last part did you get 540 or 5040?

 

[The_Boss]

For the permutations last part did you get 540 or 5040?

I don't exactly remember but I am sure it included those numbers. If u could repeat the question I might give u the exact answer

 

[The_Boss]

First expand (a+3√ 5)^2:- a^2+6a√ 5+45

Now the equation is:- a^2+6a√ 5+45+a-b√ 5=51
Taking √ 5 common:- a^2+a+45+(6a-b)√ 5=51

Now, we have to equate the integers on the left and right side:- a^2+a+45=51
Now, we have to equate the √ 5 coefficients on both sides:- 6a-b=0(It is equal to zero because there are no √ 5 coefficients on the right hand side)
(Note:-only equate the √5 coefficients after you have taken common, it is less likely that you will make errors)

Now solve the simultaneous equations
a^2+a+45=51----->1
6a-b=0----->2

a=2 or a=-3
b=12 or b=--18

Thanx a lot, bud!

 

[XxChampXx]

I don't exactly remember but I am sure it included those numbers. If u could repeat the question I might give u the exact answer

There were 8 characters altogether with two being symbols and you had to make a 6 character security code which has the symbols kept together.

 

[XxChampXx]

Thanx a lot, bud!

You are welcome.

 

[The_Boss]

There were 8 characters altogether with two being symbols and you had to make a 6 character security code which has the symbols kept together.

Well if that's the exact question then the answer is definitely not what I said before!

 

[The_Boss]

Nope!!
Maybe we'l have em in paper 2!! I'm so worried about vectors for no reason.Did u guys have 10 questions btw?

I am more worried bout permutation and combination!

 

[XxChampXx]

Nope!!
Maybe we'l have em in paper 2!! I'm so worried about vectors for no reason.Did u guys have 10 questions btw?

Yeah. Hopefully we don't have relative velocity because we had vectors in the first paper.

 

[XxChampXx]

Shit! we didnt . we'll probably have em! Damn.. theyre soo confusing!

Which chapter was the hardest for you in paper 11?

 

[XxChampXx]

They looked fairly easy! Not too tough, which reminds me of math paper 4 and paper 2.
When we are differentiating Trigonometric functions, andsupposed we have values for t(time) inside them, do we consider the values as radians?

You mean for the distance, speed and acceleration questions right? Then yeah always use radians.

 

[XxChampXx]

They looked fairly easy! Not too tough, which reminds me of math paper 4 and paper 2.
When we are differentiating Trigonometric functions, andsupposed we have values for t(time) inside them, do we consider the values as radians?

Did you have any functions question?We didn't so I am quite scared. I don't know why but I find the domain, restricted domain and range quite tricky.

 

[XxChampXx]

I am more worried bout permutation and combination!

They looked fairly easy! Not too tough, which reminds me of math paper 4 and paper 2.
When we are differentiating Trigonometric functions, andsupposed we have values for t(time) inside them, do we consider the values as radians?

When we draw a quadratic curve and there is a range and domain, do we have to draw the whole curve or only for the x values in the domain?

 

[XxChampXx]

hey are you sure that the combination answer is 14C8??

I am more worried bout permutation and combination!

How were your papers?

 

[The_Boss]

so how was paper 2?

 

[The_Boss]

How were your papers?

well paper 2 was kinda lengthy.
Guys just had a question, is similarity and congruency in syllabus of Add Maths? I just checked the syllabus and it isnt? And if i am correct
then why did we have a question on similarity in Add Maths paper 22?

 

[XxChampXx]

so how was paper 2?

It was lengthy and hard. That similarity question was so hard. Even the last question. Hopefully the grade thresholds are low.

 

[The_Boss]

It was lengthy and hard. That similarity question was so hard. Even the last question. Hopefully the grade lvl guys do ithresholds are low.

I dont think so that its gonna be that low. Wait similarity wasnt hard but it wasnt in our syllabus, but at least they gave the required expression. last question was piece of cake if u just new how remainder theorem actually works. Gonna expect the gt to be around 146-150, as O lvl guys also get the same paper and u know that most of them do really good , so dont expect it to be lower than 145.

 

[The_Boss]

It was lengthy and hard. That similarity question was so hard. Even the last question. Hopefully the grade thresholds are low.

Were u able to do the last and similarity question? If yes what answer did u get? Were they whole numbers,i mean integers ?And wanna discuss more questions/

 

[XxChampXx]

Were u able to do the last and similarity question? If yes what answer did u get? Were they whole numbers,i mean integers ?And wanna discuss more questions/

The last answer was 5 and 11 according to many good students.