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a 3 cm by 3cm square piece of carboard was cut from a bigger square cardboard. the area of the remaining cardboard was 2o cm ^2 . if s Represent the length of the bigger cardboard , which of the following expression give the area of the remaining piece?
let 's' be the length of one side of the bigger square cardboard. since it is square we can say that its area is A=s² since 3cmx3cm was cut out of it and the remaining area is 20cm² then you'll have the expression as: s² - 3² = 20 getting the value of s you'll have: s² - 3² = 20 s² - 9 = 20 s² = 20 + 9 s² = 29 s = √29 cm
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