A) i) 4Y ---------> 2^x+2 = 2^2 x 2^x therefore you get 4y

ii) 8/y ----------> 2^3-x = 2^3/2^x therefore you get 8/y

B) Sub in the answers above and then multiply by Y

C) You should be able to go on from the above answers.

Oh ok thanks :smile:

Reply 788

lone_rainbow

Original post by Filipo

Part (a) of what question?

That's okay i got it now :smile:

Reply 789

Sam10711

Original post by lone_rainbow

https://a9497d7f220e174d38d014b2b1d86a68bedc42a8.googledrive.com/host/0B1ZiqBksUHNYNExoNEtSS1ViN2c/for-Edexcel/Solomon%20B%20QP%20-%20C1%20Edexcel.pdf

can you please help me with question 7

7.
ai)
2^x+2 is the same thing as 2² X 2^x
So it would equal 4y

aii) 2^3-x is the same thing as 2³/ 2^x
So it would equal 8/y

b)
So then you just replace what you solved in part a and you will get:
4y + (8/y)=33
4y² + 8 = 33y
4y² -33y + 8 = 0

c) Part c is then a simultaneous equation which should be easy

Reply 790

mali473

Original post by Karan8298

Anyone else absolutely dreading this exam?

Yup you're not the only one :/

Posted from TSR Mobile

Reply 791

lone_rainbow

Original post by Sam10711

Thanks so much for the help :smile:

Reply 792

Filipo

Original post by lone_rainbow

Oh ok thanks :smile:

Note on the rules and remember them:

Adding powers is multiplication.
Subtracting powers is division.

Spoiler

Reply 793

Imjustaloner

Is anyone dreading D1?

Reply 794

Jassy16

what proof do we need to know

Reply 795

KINGYusuf

Momentum is actually so important before the exam. If you're feeling good, you'll do good lol

Reply 796

Filipo

Original post by Jassy16

what proof do we need to know

Arithmetic for the sum, and finding the number of terms in a sequence (this one leads on from finding the sum of sequences).

Reply 797

lone_rainbow

Original post by KINGYusuf

Momentum is actually so important before the exam. If you're feeling good, you'll do good lol

That's partly true but you also have to be well prepared lol :biggrin:

Reply 798

Imjustaloner

Original post by KINGYusuf

Momentum is actually so important before the exam. If you're feeling good, you'll do good lol

For a second there, I thought you were talking about physics.. 😂😂

Reply 799

Sam10711

Original post by The Panic Queen

If anyone has a spare moment could you help me with Solomon E Question 8c?

1 / (x-1) = 2 + (1/x)

1 = (2 + 1/x) (x-1)

1 = 2x - 2 + x/x - 1/x

1 = 2x -2 +1 - 1/x

1 = 2x -1 -1/x

2x - 2 - 1/x = 0

2x² -2x -1 = 0

Quadratic Formula :

2 ± √(4- (4 X 2 X -1) All divided by 4

(2 ± √12) / 4

(2 ± 2√3) / 4

0.5 ± 0.5√3