Topic 4: Area

Try the problem below. After you try the problem, you can watch a video to see a correct solution.
The length and width of a rectangle is represented by \(2x +1\) and \(x + 3\) respectively. If the area of a rectangle is the length times the width, find the area of this rectangle.
A
\(\displaystyle{3x+4}\)
B
\(\displaystyle{3x^2+5x+3}\)
C
\(\displaystyle{2x^2 + 5x +3}\)
D
\(\displaystyle{2x^2 +7x +3}\)
E
\(\displaystyle{2x^2 +6x + 3}\)
Proportions
Proportions

After watching the video, try this problem to practice more.

Proportions
Proportions
The length and width of a rectangle is represented by \(x – 4\) and \(3x + 2\) respectively. Find the area of this rectangle.
A
\(\displaystyle{3x^2-10x-8}\)
B
\(\displaystyle{4x-2}\)
C
\(\displaystyle{4x^2+5x-8}\)
D
\(\displaystyle{3x^2-14x-8}\)
E
\(\displaystyle{3x^2-10x-2}\)