Maths, Addmaths and Statistics: Post your doubts here!

[Faizan Muhammmad]

BTW, the scales of TRAPZIUM makes it Almost Impossible to be TAngent! ***amd*** #Dhoka

mainay to bhai answer nikal dia tha
possible or not is another thing

 

[princess Anu]

Correct to the nearest cm means we have to round off the answer?

 

[exploded diper]

in quadratic equations like x^2 + 30x + 64800 = 0
i try to find the factors by multiplying random numbers ..... do we have to show how we got the answer.. ( not by using the x wali equation ) .... is theere method to show how to gain the factors in this case ..240 and -270 ...or is it okay if we dont show how we gained them ..

 

[FLRNAB]

in quadratic equations like x^2 + 30x + 64800 = 0
i try to find the factors by multiplying random numbers ..... do we have to show how we got the answer.. ( not by using the x wali equation ) .... is theere method to show how to gain the factors in this case ..240 and -270 ...or is it okay if we dont show how we gained them ..

I find them like this:
Two numbers whose product will be "-64800" and their Addition yields "+30"

I show this working:
x^2 + 30x - 64800 = 0
x^2 + 270x -240x - 64800 = 0
x(x + 270) -240(x + 270) = 0
(x + 270)(x - 240) = 0

 

[funky brat]

in quadratic equations like x^2 + 30x + 64800 = 0
i try to find the factors by multiplying random numbers ..... do we have to show how we got the answer.. ( not by using the x wali equation ) .... is theere method to show how to gain the factors in this case ..240 and -270 ...or is it okay if we dont show how we gained them ..

The way I do is that I multiply the coefficient of x with the last number and then take out the factors through factorization method.

 

[funky brat]

12/x -x =y
when two line intersect ...their coordinates are same
so the equations of the two lines beome equal..
for the equation 12/x=2x to become 12/x -x=y we could minus x on boths sides of the second equation..
this way we would get 12/x-x=x
and hencce we will get y=x

Yeh third line se samajh nahi ai..

 

[exploded diper]

I find them like this:
Two numbers whose product will be "-64800" and their Addition yields "+30"

I show this working:
x^2 + 30x - 64800 = 0
x^2 + 270x -240x - 64800 = 0
x(x + 270) -240(x + 270) = 0
(x + 270)(x - 240) = 0

The way I do is that I multiply the coefficient of x with the last number and then take out the factors through factorization method.

vats a quick way of showing ur working through which we came to the answer tht the two factors are 240x and 270x.....

 

[era30amy]

Correct to the nearest cm means we have to round off the answer?

If you are talking about upper bound and lower bound, then you have to divide 1/2, as per stated that it's correct to the 'nearest cm'.
For example, if they say 'correct to the nearest 10 cm, then you have to divide 10 by 2.
The answer would be 5. For calculating upper bound, add 5 to whatever the number is. And for lower bound, subtract 5.

Geddit?

 

[funky brat]

vats a quick way of showing ur working through which we came to the answer tht the two factors are 240x and 270x.....

Well, idk if you do this just by thinking. You can use any other easy method.

 

[era30amy]

Well, idk if you do this just by thinking. You can use any other easy method.

What's the question?

 

[funky brat]

What's the question?

Yar wo quadratic equations main factors nikalna.

 

[era30amy]

Yar wo quadratic equations main factors nikalna.

Question bata behan

 

[princess Anu]

If you are talking about upper bound and lower bound, then you have to divide 1/2, as per stated that it's correct to the 'nearest cm'.
For example, if they say 'correct to the nearest 10 cm, then you have to divide 10 by 2.
The answer would be 5. For calculating upper bound, add 5 to whatever the number is. And for lower bound, subtract 5.

Geddit?

you are right but i was talking about giving the answer to nearest cm

 

[funky brat]

Question bata behan

Baji question koi nahi hai.

 

[funky brat]

In part d how do we know y=x ki line draw karni hai? :/

era30amy
Can you explain?

 

[exploded diper]

Yeh third line se samajh nahi ai..

suuppose if we were already given the equation y= x and then we can say that at the point of intersection the two equations are equal and
12/ x - x = x ( since y = y ) ...... so they just changed <---- this equation into 12/x = -2x ....
to gain the equation 12/ x - x which was already given ..... we subtract x on both sides .....get it?

Well, idk if you do this just by thinking. You can use any other easy method.

so we dont have to show the working right ... they wouldnt cut our answers? b y the way is completing square in our syllabus?

 

[funky brat]

suuppose if we were already given the equation y= x and then we can say that at the point of intersection the two equations are equal and
12/ x - x = x ( since y = y ) ...... so they just changed <---- this equation into 12/x = -2x ....
to gain the equation 12/ x - x which was already given ..... we subtract x on both sides .....get it?

so we dont have to show the working right ... they wouldnt cut our answers? b y the way is completing square in our syllabus?

I'm not sure but that's just rough work how you obtain that.
Yeah, it is and it's quite an easy method.
Why don't you use that formula x=-b... wala?

 

[exploded diper]

I'm not sure but that's just rough work how you obtain that.
Yeah, it is and it's quite an easy method.
Why don't you use that formula x=-b... wala?

i dont use completing square cuz i dont know it well.it nvr gets in my mind .......but does usually cum in papers like being directly asked for doing it...........

 

[princess Anu]

In this first we have to find inverse of F and then see through our graph the value of corresponding y? :S

 

[funky brat]

i dont use completing square cuz i dont know it well.it nvr gets in my mind .......but does usually cum in papers like being directly asked for doing it...........

No, no never. They just ask you to find the solution by any method.