The length of a rectangle is twice its breadth .If its length is decreased by 5cm and breadth is increased by 5cm,the area of the rectangle is increased by 75sq.cm .Find the length of the rectangle
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Answer:
40cm.
Step-by-step explanation:
length = 2a , width = a
(2a-5)(a+5) = 75
2a² - 15a -100 = 0
a = 15±√625 ÷2
2a = 15±25
2a = 15+25
2a = 40 cm = length
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