Question 246835
x(x+2)=100
x^2+2x-100=0
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
x=(-2+-sqrt[2^2-4*1*-100])/2*1
x=(-2+-sqrt[4+400])/2
x=(-2+-sqrt404)/2
x=(-2+-20.1)/2
x=(-2+20.1)/2
x=18.1/2
x=9.05 ans for the width
9.05+2=11.05 ans. for the length.
Proof:
9.05*11.05=100
100~100