a plot of land doubles in size by adding x meters to the length and x meters to the width of the land. If the original plot had an area of 200 by 300 meters, what is the value of x
2*200*300=(200+x)(300+x) 120000=60000+200x+300x+x^2 x^2+500x-60000=0 (x+600)(x-100)=0 x=-600 or x=100 length is positive thus negative value is ignored. So answer is 100
