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Math Help - Simultanous equations

  1. #1
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    Dec 2008
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    Simultanous equations

    hi
    i find these really difficult
    Solve y = 2x^2 + 3 and x^2– xy= –4 simultaneously
    i know ir shouldnt be, i just think they are[/FONT]
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  2. #2
    Newbie Arch_Stanton's Avatar
    Joined
    Nov 2008
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    x \in R
    \left\{\begin{array}{cc}y=2x^2+3  \\x^2-xy=-4    \end{array}\right.
    \left\{\begin{array}{cc}y=2x^2+3  \\x^2-x(2x^2+3)=-4    \end{array}\right.
    \left\{\begin{array}{cc}y=2x^2+3  \\(x-1)(2x^2+x+4)=0    \end{array}\right.
    \left\{\begin{array}{cc}y=2+3  \\x=1    \end{array}\right.
    \left\{\begin{array}{cc}y=5  \\x=1    \end{array}\right.
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