Question

10. The perimeter of a rectangle is 28 cm. Which of the following express the area
of the rectangle in terms of the width x?
A. 28x - x?
B. 18x - x?
C. 14x - x2
D. 7x - x2​

Answer 1

Answer:

Perimeter = 28cm

Width = x

Perimeter = 2(l+b)

28cm/2 = l+b

l = 14cm - b

l = 14cm - x

Now,

Length = 14- x

Breadth = x

Area of rectangle = l × b

= x(14 - x)

= 14x - x²

Option C is correct

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