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Aqa further pure 1 exam 15/06/2016

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    I have a graphical calculator (casio fx-9750GII) and I am aware that it can help me in some aspects of the exam. I don't know how to use it to it's full extent and I need all the help I can get. Any ideas?

    So on the june 2012 paper, question 6bi, the question is asking for a rotation followed by an enlargement which equals to the matrix shown. However the answer is not the same as what i got, but i put through my answer into my graphics calculator and i am 100% sure it is correct, would this still get marks on the test?
    The question

    The matrix M is defined by M = [-1, -1]
    [ 1,-1]
    Given that M represents an enlargement followed by a rotation, find the scale factor of the enlargement and the angle of rotation.
    Their answer is enlargement root 2
    Angle of rotation 135 degrees anticlockwise

    However my answer :
    Enlargement negative root 2
    Angle of rotation 45 clockwise

    As [cos - 45, - sin -45] multiplied by [ -root2, 0]
    [sin -45, cos -45 ] [0, -root2]

    Also equals to [-1, -1]
    [1, -1]
    But my answer isn't in the answer area.
    Am i right??
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