Question

Jon'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?

Answer 1

\[(20+w)(24+w)=672\]
\[480+44w+w^2=672\]
\[w^2 + 44w - 192 = 0\]
\[(w+48)(w-4) = 0\]
\[w = -48\] or \[w = 4\]

w > 0 so

w = 4

the trim is half the extra part wide, so

the trim is 2 cm wide!

Answer 2

I mean its 4 not 2 :D

Answer 3

Thaaank youu sooo muchhhh'<3