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Math Help - equations

  1. #1
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    equations

    Hi,

    Im trying a different question on the same topic as my orignal thread but Im still not sure how to find:-

    <br />
C_R<br />

    When:-

    <br />
2-C_R^2=2-2.6C_R+1.8C_R^2<br />

    Cheers,

    Ben
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  2. #2
    A riddle wrapped in an enigma
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    Looks like it works the same way as the other one you posted:

    2-C_R^2=2--2.6C_R+1.8C_R^2

    Subtract 2 from each side; then, add C_R^2 to both sides.

    0=-2.6C_R+2.8C_R^2

    2.8C_R^2-2.6C_R=0

    Factor out a 2C_R

    2C_R(1.4C_R-1.3)=0

    2C_R=0 \ or \ 1.4C_R=1.3

    Working with the latter equation:

    C_R=\frac{1.3}{1.4}= \frac{13}{14}
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