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AQA AS Mathematics MPC2 June 2010 Q7(b)(ii) watch

    • Thread Starter

    Hi all,

    I have attached a screenshot of the question I am referring to.

    I was doing the above paper and I got this question wrong because I did not arrive at both values.

    I can't understand why the other value (x = 2.617) works? I can arrive both the values in the mark scheme (x = 0.524 / 2.617) but I don't understand why the value x = 2.617 works? The two x values only share the same absolute y value?

    Any help is much appreciated!
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    (Original post by londoncricket)
    They have the same 'absolute y-value' yes, but because you're working with squared expressions, this is to be expected, since squaring removes the sign.
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Updated: February 28, 2016
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