Calculate Rectangle Area: Finding x(x-4) with Variable Dimensions

The width of a rectangle is equal tox x cm and its length is x−4 x-4 cm.


Calculate the area of the rectangle.

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Step-by-step video solution

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00:00 Calculate the area of the rectangle
00:03 Apply the formula for calculating the area of a rectangle (side x side)
00:08 Substitute in the relevant values according to the given data and proceed to solve for the area
00:11 Expand the parentheses - multiply each factor
00:14 This is the solution

Step-by-step written solution

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1

Understand the problem

The width of a rectangle is equal tox x cm and its length is x−4 x-4 cm.


Calculate the area of the rectangle.

2

Step-by-step solution

The area of the rectangle is equal to the length times the width:

S=x×(x−4) S=x\times(x-4)

S=x2−4x S=x^2-4x

3

Final Answer

X2−4X X^2-4X

Practice Quiz

Test your knowledge with interactive questions

Look at the rectangle ABCD below.

Side AB is 6 cm long and side BC is 4 cm long.

What is the area of the rectangle?
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