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    jonnie_b0i's Avatar
    jonnie_b0i Posts: 4, Reputation: 1
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    #1

    Mar 22, 2007, 04:31 AM
    Quadratics functions
    Hi I need help on these multiple choice questions

    The solutions of the equation 3x^2+7x-5=0 are:

    A.both rational B.both real C.not real D.equal and rational E. equal and real

    The equation 9x^2-24x+16 has:

    A.no real solutions B.one rational solution C.two rational solutions D.one irrational solution E.two irrational solutions

    The equations 3x^2+6x+4 has:

    A.no real solutions B.one rational solution C.two rational solutions D.one irrational solution E.two irrational solutions

    The equation ax^2+bx+c=0, where b>a>c>0 has:

    A. no real solutions B:two real solutions of opposite signs C.two real negative solutions D.two real positive solutions E.insufficient information to determine the type of solutions


    I just don't get all the real, rational stuff
    Thanks
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
    Uber Member
    		  
    #2

    Mar 22, 2007, 04:36 AM
    Real means not imaginary or complex, an imaginary or complex number involves the square root of a negative number, so real means a number that does not involve the square root of a negative number.

    Rational means that it is expressable in the form where A and B are integers. For example, and are irrational, because they cannot be expressed in this way.

    Does this help? Please ask if you need further guidance :)
    jonnie_b0i's Avatar
    jonnie_b0i Posts: 4, Reputation: 1
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    #3

    Mar 22, 2007, 05:46 AM
    Yea it kind of does
    But I wouldn't know the way to solve it
    Thanks
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Mar 22, 2007, 05:48 AM
    Well you either factorise or use the quadratic formula. You should have been taught how to do both of these.
    jonnie_b0i's Avatar
    jonnie_b0i Posts: 4, Reputation: 1
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    #5

    Mar 22, 2007, 05:54 AM
    Yes I have
    Thanks so much
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