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Quadratics functions

Asked Mar 22, 2007, 04:31 AM — 4 Answers
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

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4 Answers
Capuchin's Avatar
Capuchin Posts: 5,319, Reputation: 3601
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#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
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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
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Capuchin's Avatar
Capuchin Posts: 5,319, Reputation: 3601
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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.
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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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