Please Help!
on's new mini computer monitor has a 20 cm by 24 cm LCD screen with a plastic trim border. The total area of the monitor and border is 672 cm2. How wide is the trim around the monitor?

Question

Please Help! 
on's new mini computer monitor has a 20 cm by 24 cm LCD screen with a plastic trim border. The total area of the monitor and border is 672 cm2. How wide is the trim around the monitor?

anonymous · Answer

(20+w)(24+w)=672
480+44w+w^2=672
w^2 + 44w - 192 = 0
(w+48)(w-4) = 0
w = -48 or w = 4
w > 0 so

w = 4

the trim is half the extra part wide, so

the trim is 2 cm wide!

anonymous · Answer

dang your the best!