dayanaraa61
05.05.2020 •
Mathematics
A rectangle has a width that is 7 centimeters less than its length, and its area is 330 square centimeters. What are
the dimensions of the rectangle?
length =
centimeters
width =
centimeters
Solved
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Ответ:
w = 15 cm
l = 22 cm
Step-by-step explanation:
A = w·l
w = l - 7
A = (l - 7)·l
330 = l² - 7l
l² - 7l - 330 = 0
l² + 15l - 2l - 330 = 0
l(l + 15) - 22(l + 15) = 0
(l - 22)(l + 15) = 0
l - 22 = 0 => l = 22 cm
l + 15 = 0 => l = - 15 < 0 (f)
w = l - 7 = 22 - 7 => w = 15 cm
Ответ:
A
Explanation: