Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter

    I'm self teaching from the new edxcel FP1 book (the green one written by Keith Pledger) and I've come across a question where the provided answer doesn't make sense to me...

    Q15, Review exercise 2

    The transformation T maps the point with coordinates (1,0) to the point with co-ordinates (3,2), and the point with coordinates (2,1) to the point with coordinates (6,3). T is represented by the (2x2) matrix M. Find M.

    They give the answer M= (3, -4)
    (2, -3)

    but I get M = (3, 0)
    (2, -1)

    If Pledger is right, how come?
    • Thread Starter

    That didn't render right, let me try again

    Their answer for M
    (3, -4)
    (2, -3)

    My answer for M
    (3, 0)
    (2, -1)

    Your answer is right. A quick way to check is to multiply M by (1,0) and (2,1) and check you get the desired answers (technically they should be column vectors but you get the idea).
What's the best type of cheese?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


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