Mr M’s Edexcel GCSE Mathematics A Higher Linear Paper 2 Answers June 2012

Reply 1040

Aarongreatbanks

Original post by Loiks94

b.

So say i have

x^2+3x-10

How would you solve it and what would you write on the answer line

Reply 1041

Aarongreatbanks

Original post by usycool1

All of them are fine and none will lose you marks. I tend to write a) or b) but c) is fine too. :smile:

I just seen

x2 – 3x – 4 = 0
(x + 1)(x – 4) = 0
x + 1 = 0 or x – 4 = 0
x = –1 or x = 4

The solution is x = –1, 4

Online. What does the comma mean and is this ok?

Reply 1042

usycool1

19

Original post by Aarongreatbanks

I just seen

x2 – 3x – 4 = 0
(x + 1)(x – 4) = 0
x + 1 = 0 or x – 4 = 0
x = –1 or x = 4

The solution is x = –1, 4

Online. What does the comma mean and is this ok?

The comma is fine. :smile:

Reply 1043

Aarongreatbanks

Original post by usycool1

The comma is fine. :smile:

"x – 3 = 0 or x – 4 = 0

This gives me simple linear equations, and they're easy to solve:

x = 3 or x = 4

And this is the solution they're looking for: x = 3, 4

Note that "x = 3, 4" means the same thing as "x = 3 or x = 4"; the only difference is the formatting. The "x = 3, 4" format is more-typically used."

This was online?

Reply 1044

Aarongreatbanks

Original post by usycool1

The comma is fine. :smile:

Online a answer for the quadratic formula was: "Then the answer is x = –2.41, x = 0.41, rounded to two decimal places"

But this was the answer for soliving quadratics: x – 3 = 0 or x – 4 = 0

This gives me simple linear equations, and they're easy to solve:

x = 3 or x = 4

And this is the solution they're looking for: x = 3, 4

Note that "x = 3, 4" means the same thing as "x = 3 or x = 4"; the only difference is the formatting. The "x = 3, 4" format is more-typically used.

What's the difference between x=3,4 and x=-2.41,x=0.41?

Reply 1045

Aarongreatbanks

Original post by usycool1

The comma is fine. :smile:

Please helo

Online a answer for the quadratic formula was: "Then the answer is x = –2.41, x = 0.41, rounded to two decimal places"

But this was the answer for soliving quadratics: x – 3 = 0 or x – 4 = 0

This gives me simple linear equations, and they're easy to solve:

x = 3 or x = 4

And this is the solution they're looking for: x = 3, 4

Note that "x = 3, 4" means the same thing as "x = 3 or x = 4"; the only difference is the formatting. The "x = 3, 4" format is more-typically used.

What's the difference between x=3,4 and x=-2.41,x=0.41?

Reply 1046

L'Evil Fish

18

Original post by usycool1

All of them are fine and none will lose you marks. I tend to write a) or b) but c) is fine too. :smile:

He won't listen :frown:

I've told him numerous times that I always say or... He doesn't believe me :redface:

Reply 1047

Aarongreatbanks

Original post by shadab786ahmed

He won't listen :frown:

I've told him numerous times that I always say or... He doesn't believe me :redface:

I do beleive you but i got given a AS sheet to practise and the asnwer to a qaudraction equation is x=3,4

Look what i found online

Online a answer for the quadratic formula was: "Then the answer is x = –2.41, x = 0.41, rounded to two decimal places"

But this was the answer for soliving quadratics: x – 3 = 0 or x – 4 = 0

This gives me simple linear equations, and they're easy to solve:

x = 3 or x = 4

And this is the solution they're looking for: x = 3, 4

Note that "x = 3, 4" means the same thing as "x = 3 or x = 4"; the only difference is the formatting. The "x = 3, 4" format is more-typically used.

What's the difference between x=3,4 and x=-2.41,x=0.41?

Reply 1048

Aarongreatbanks

Original post by shadab786ahmed

He won't listen :frown:

I've told him numerous times that I always say or... He doesn't believe me :redface:

I do beleive you but i got given a AS sheet to practise and the asnwer to a qaudraction equation is x=3,4

Look what i found online

Online a answer for the quadratic formula was: "Then the answer is x = –2.41, x = 0.41, rounded to two decimal places"

But this was the answer for soliving quadratics: x – 3 = 0 or x – 4 = 0

This gives me simple linear equations, and they're easy to solve:

x = 3 or x = 4

And this is the solution they're looking for: x = 3, 4

Note that "x = 3, 4" means the same thing as "x = 3 or x = 4"; the only difference is the formatting. The "x = 3, 4" format is more-typically used.

What's the difference between x=3,4 and x=-2.41,x=0.41?

Reply 1049

Loiks94

11

Original post by Aarongreatbanks

I do beleive you but i got given a AS sheet to practise and the asnwer to a qaudraction equation is x=3,4

Look what i found online

Online a answer for the quadratic formula was: "Then the answer is x = –2.41, x = 0.41, rounded to two decimal places"

But this was the answer for soliving quadratics: x – 3 = 0 or x – 4 = 0

This gives me simple linear equations, and they're easy to solve:

x = 3 or x = 4

And this is the solution they're looking for: x = 3, 4

Note that "x = 3, 4" means the same thing as "x = 3 or x = 4"; the only difference is the formatting. The "x = 3, 4" format is more-typically used.

What's the difference between x=3,4 and x=-2.41,x=0.41?

The answers are from whole different Quadratic formulas.. For example the first one is solved using the usual method; find two numbers that add up to the x number and multiply to make the other number. The answer to the 2.41 and 0.41 is found by using the formula method.. They are different Quadratics in the first place.

Reply 1050

mia_hilton

hi guys, (sorry, nothing to do with the answers) can anyone please help me on this question that i'm stuck on?..please
6. A straight line, L, passes through the point with coordinates (4, 7) and is perpendicular to the
line with equation y = 2x + 3.
Find an equation of the straight line L.

Reply 1051

usycool1

19

Original post by mia_hilton

hi guys, (sorry, nothing to do with the answers) can anyone please help me on this question that i'm stuck on?..please
6. A straight line, L, passes through the point with coordinates (4, 7) and is perpendicular to the
line with equation y = 2x + 3.
Find an equation of the straight line L.

Find the gradient of line L (remember: The gradient of two lines that are perpendicular to each other will have a product of -1).

Then substitute in the gradient and x/y coordinates for line L into

y=mx+c

or

y-y_1=m(x-x_1)

to get the equation. :smile:

Reply 1052

kc1997

6

Can you please explain how to get the answer for Q14 part d

Reply 1053

Robbie242

If I did this exam now I'd be able to get an A* grrr

Reply 1054

carbonita

Pretty useless... the exam was 4 months ago.

Reply 1055

Sapphire109

Could someone please help me with the pythagoras theorem and trigonometry question 18. I dunno y I keep gettin the wrong answer that isn't 16.5cm
I started with 16^2+12^2=400
sqrt of 400=20

then after that I did CD=20/tan(40) please help me as soon as possible. Today please thanks

Reply 1056

usycool1

19

Original post by Sapphire109

Could someone please help me with the pythagoras theorem and trigonometry question 18. I dunno y I keep gettin the wrong answer that isn't 16.5cm
I started with 16^2+12^2=400
sqrt of 400=20

then after that I did CD=20/tan(40) please help me as soon as possible. Today please thanks

You're trying to work out the length of BD, which isn't the hypotenuse. So you're supposed to find the square root of (16^2 - 12^2) rather than (16^2 + 12^2). :smile:

Reply 1057

__Student__

For last question 26 (b) what is the topic called. I know it's vectors but that kind of question in specific?