Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    So i was followingan example from the C1 textbook and understood untill a certain point.

    2x^2 +10x +7=0 so they take a fcator of 2 out to give 2(x^2+5x)+7

    then half b 2(x+5/2)^2 -25/4 +7

    I dont understand this next bit: 2(x+5/2)^2 -25/2 +7 = 2(x+5/2)^2 -11/2 How did the -25/4 turn into -25/2 ?
    Offline

    2
    ReputationRep:
    umm hold on i'll have to write that down
    Offline

    2
    ReputationRep:
    okay i'm confused too..
    my answer to that question would be (x +2.5)^2+9.75 hmmmm... is this for AS level? i'm taking AS level too :s
    Offline

    18
    ReputationRep:
    (Original post by hazbaz)
    So i was followingan example from the C1 textbook and understood untill a certain point.

    2x^2 +10x +7=0 so they take a fcator of 2 out to give 2(x^2+5x)+7

    then half b 2(x+5/2)^2 -25/4 +7

    I dont understand this next bit: 2(x+5/2)^2 -25/2 +7 = 2(x+5/2)^2 -11/2 How did the -25/4 turn into -25/2 ?
    they've converted the +7 into a fraction, +14/2, so -25/2 + 14/2 = -11/2
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by thegodofgod)
    they've converted the +7 into a fraction, +14/2, so -25/2 + 14/2 = -11/2
    Ye but origionally the number was -25/4 and 7 & so surly they need to make the 7 a common denominator to get 28/4 and do it that way?
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by foldingstars45)
    okay i'm confused too..
    my answer to that question would be (x +2.5)^2+9.75 hmmmm... is this for AS level? i'm taking AS level too :s
    Ye it is i think i get it now though what A levels are you doing?
    Offline

    2
    ReputationRep:
    (Original post by hazbaz)
    Ye it is i think i get it now though what A levels are you doing?
    haha, was mine wrong then?
    andd i'm doing 3 sciences and maths but taking physics was a big mistake u?
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by foldingstars45)
    haha, was mine wrong then?
    andd i'm doing 3 sciences and maths but taking physics was a big mistake u?
    I think so it was what the previous poster said . And nah Physics is amazing. I'm doing Maths chemistry Physics History and depending how i do in C1 imma start further Maths and do that poissbly up to A2 but defo for AS
    Offline

    2
    ReputationRep:
    (Original post by hazbaz)
    I think so it was what the previous poster said . And nah Physics is amazing. I'm doing Maths chemistry Physics History and depending how i do in C1 imma start further Maths and do that poissbly up to A2 but defo for AS
    oh i wish i'd took history instead of physics! but it's too late now.. maybe i'll take it up for AS next year. what grades did you get in gcse?
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by foldingstars45)
    oh i wish i'd took history instead of physics! but it's too late now.. maybe i'll take it up for AS next year. what grades did you get in gcse?
    But Physics is good! and 9A*'s 2A's you?
    Offline

    2
    ReputationRep:
    (Original post by hazbaz)
    But Physics is good! and 9A*'s 2A's you?
    nah i'm just not so interested anymore :/ and woah! that's amazing, i got 4a*s and 6 a's
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by foldingstars45)
    nah i'm just not so interested anymore :/ and woah! that's amazing, i got 4a*s and 6 a's
    Its ok and well done!
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.