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galaxychild101
09.04.2020 •
Mathematics
The perimeter of a rectangle is 42 cm and the area is 80 cm. write an equation to model the situation and find the dimensions of the rectangle
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Ответ:
l = 5
w = 16
OR
l = 16
w = 5
Step-by-step explanation:
p=2l+2w
A=l*w
42=2l+2w
divide by 2
21=l+w
solve for either l or w (I'll solve for l)
21-w=l
plug in l to area equation
80= (21-w)*w
80=21w-w²
bring the right side to the left side of the equation
w²-21w+80=0
find the zeros
w=5,16
plug w into the equation to find l
21-5=16
21-16=5
l=5,16
l = 5
w = 16
OR
l = 16
w = 5
Ответ:
Step-by-step explanation:
Step-by-step explanation: