Question 1140158
TERMS : <pre>a,  ar,   ar^2</pre>

{{{system(a+ar=9,ar^2=12)}}}


{{{a(1+r)=9}}}

{{{a=9/(r+1)}}}

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{{{(9/(r+1))r^2=12}}}

{{{9r^2=12r+12}}}

{{{3r^2=4r+4}}}

{{{3r^2-4r-4=0}}},


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{{{r=(4+- sqrt(16+4*3*4))/6}}}

{{{r=(4+- 4*sqrt(4))/6}}}

{{{r=(4+- 8)/6}}}
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Common Ratio, {{{system(r=-2/3,OR,r=2)}}}


Find the "a" which corresponds to each of those using {{{a=9/(r+1)}}}.
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