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March 25, 2017

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find the value(s) of x for which f(x)=g(x).

f(x)=x^4-2x^2,g(x)=2x^2

  • pre-cal - ,

    set them equal, and solve for x

    x^4-2x^2=2x^2
    x^4-4x^2=0
    (x^2-2x)(x^2+2x)=0
    x^2(x-2)(x+2)=0
    and now you have four solutions (two zeroes).

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