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Math Help - [SOLVED] Having trouble with finding rational zeros for each function??

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    Question [SOLVED] Having trouble with finding rational zeros for each function??

    state all possible rational zeros for the function

    here is one of the problems i'm having trouble with:

    f(x)= x^3+2x-3x+5

    i know: p= +1, -1, +5, -5
    q= same

    but none of them seem to equal to zero when i put them in <---me


    one that i have NO IDEA how to do is:

    find all rational zeros for each function

    f(x)= (x-3)(x+5)(2x+5)

    Thanks for any help in advance -Liza
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    Quote Originally Posted by twiggy5492 View Post
    state all possible rational zeros for the function

    here is one of the problems i'm having trouble with:

    f(x)= x^3+2x-3x+5

    i know: p= +1, -1, +5, -5
    q= same

    but none of them seem to equal to zero when i put them in <---me
    Hi Liza,

    So, I guess it doesn't have any rational zeros, huh? And are you sure you didn't make a typo there. Should it be:

    f(x)=x^3+2x^2-3x+5

    Either way, there are no rational zeros.

    Quote Originally Posted by twiggy5492 View Post
    one that i have NO IDEA how to do is:

    find all rational zeros for each function

    f(x)= (x-3)(x+5)(2x+5)

    Thanks for any help in advance -Liza
    f(x)= (x-3)(x+5)(2x+5)

    (x-3)(x+5)(2x+5)=0

    x-3=0

    x+5=0

    2x+5=0

    Solve the above 3 equations to find your zeros.
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