Question 94625
1. Integers: any whole number

Let a=2, b=6, c=-12

{{{y=2x^2+6x-12}}}



2. Rational Number: any number that is a <font size=4><b>ratio</b></font> (or fraction) of two integers. So {{{1/4}}} and {{{2/1}}} are rational numbers

Let {{{a=1/4}}},{{{b=1/2}}}, {{{c=-1/12}}}, 


{{{y=(1/4)x^2+(1/2)x-1/12}}}


3. Irrational number: any number that <font size=4><b>cannot</b></font> be represented by a fraction of two integers. For example {{{pi}}} and {{{sqrt(37)}}} are irrational numbers


{{{a=sqrt(15)}}}, {{{b=pi}}}, {{{c=sqrt(12)}}},  


{{{y=sqrt(15)x^2+pi*x+sqrt(12)}}},