anonymous
  • anonymous
Sam's plasma TV has a 14 in by 18 in screen with a plastic trim border. The total area of the TV and border is 480 in2. How wide is the trim around the TV?
Mathematics
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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dumbcow
  • dumbcow
first subtract the areas 480 - 14*18 = 228 Let x be width of trim trim can be divided into 4 rectangles plus the 4 square corners corner area = x^2 2 rectangles = 14x 2 rectangles = 18x -> 4x^2 +28x +36x = 228 4x^2 +64x-228 = 0 x^2 +16x - 57 = 0 (x+19)(x-3) = 0 **x must be positive** x = 3
dumbcow
  • dumbcow
make sense ?

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anonymous
  • anonymous
Shouldn't it be more since it's all around the T.V?
dumbcow
  • dumbcow
you are thinking length...it just wants how wide the trim is so its 3in. from edge of screen to edge of TV
dumbcow
  • dumbcow
the length or perimeter of the trim would be 18+18+14+14+3+3+3+3 = 76 in

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