anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
(20+x)(24+x)=672 x is the width of the border
anonymous
  • anonymous
I got x^2+44x+480=672. What do I do now?
anonymous
  • anonymous
solve x^2+44x-192=0

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anonymous
  • anonymous
How do I solve that?
anonymous
  • anonymous
you can factor what factors of -192 add up to +44, (one is negative, one is positive)
anonymous
  • anonymous
+4 & -48.
anonymous
  • anonymous
close, +48 and -4
anonymous
  • anonymous
so your factored equation is (x+48)(x-4)=0
anonymous
  • anonymous
x=-48, 4 because length can't be negative, you discard the -48 the width of the border is 4 cm
anonymous
  • anonymous
you mean, you discard -4 and have a width of 48 cm

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