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

    1
    ReputationRep:
    Hi Guys I am struggling to see how the following equation simplifies as the answer on the bottom!

    Can anyone show me where to start please?

    Name:  0.JPG
Views: 54
Size:  13.2 KB
    Offline

    15
    ReputationRep:
     \displaystyle =(3x+1)^4 [(3x+1)+15x ] .
    Just taking out the factor common to both terms. Then obviously simplify further to get the result.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by B_9710)
     \displaystyle =(3x+1)^4 [(3x+1)+15x ] .
    Just taking out the factor common to both terms. Then obviously simplify further to get the result.
    hello thanks for the reply, I am trying to pull (3x+1)^4 as a common factor out but i'd really love to see 18 where that comes from?
    Offline

    2
    ReputationRep:
    (Original post by MLW12345)
    hello thanks for the reply, I am trying to pull (3x+1)^4 as a common factor out but i'd really love to see 18 where that comes from?
    In the square brackets you have:
    [ (3x+1) + 15x ].

    This can be simplified, as you have two sets of Xs, the 3x and the 15x. When you add them, you get 18x.
    So your final result for the square brackets will be [ 18x + 1 ].
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by JLegion)
    In the square brackets you have:
    [ (3x+1) + 15x ].

    This can be simplified, as you have two sets of Xs, the 3x and the 15x. When you add them, you get 18x.
    So your final result for the square brackets will be [ 18x + 1 ].

    Got it thank you I could not see this until then thank you
 
 
 
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.