Question 130597
If the width is x, then the length must be 4x, and the area must be x * 4x.


{{{x*4x=9}}}


{{{4x^2=9}}}


{{{x^2=9/4}}}


{{{x=sqrt(9/4)}}}


{{{x=sqrt(9)/sqrt(4)}}}


{{{x=3/2}}} (ignore the negative square roots because we are looking for a length measure)


So the width is {{{3/2}}} meter.  That means the length is {{{4(3/2)=6}}} meters.


Check the answer:


{{{6(3/2)=3*3=9}}} answer checks.