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lokiliddel
15.12.2020 •
Mathematics
(PLEASE HELP ME ASAP a) The length of a rectangle is 3 m longer than its width and the area of the rectangle is 108 m². Find its length.
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Ответ:
Area is (width)(Length) = (width)(width+3)
W
| |
| |
| | L = w+3
| |
| |
A = (w+3)(w)
A = w2 + 3w = 108.
(Problem states that area is 108 sq in)
Need to solve this quadratic equation
w2 + 3y - 108 = 0
Factor:
(w - 9) (w + 12) = 0
So
w - 9 = 0. or. w + 12 = 0
Solve these and get
w = 9. or. w = -12
Only one that makes sense in real life is the poitive one.
So the dimensions are
Width = 9 inches
Length = 12 inches
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the answer is to talk to only boys
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