A rectangle has an area of21x+81square units. If the width is 3 units, what is the length of the rectangle?

The length of the rectangle is 7x + 27

Step-by-step explanation:

Given;

area of the rectangle, A = 21x + 81 units²

width of the rectangle, w = 3 units

let the length of the rectangle, = L

Area of the rectangle = length x width

A = L x w

21x + 81 = 3L

L = ¹/₃(21x + 81)

L = 7x + 27

Therefore, the length of the rectangle is 7x + 27

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