# 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 $$\displaystyle{2x^2 +6x + 3}$$

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

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 $$\displaystyle{3x^2-10x-2}$$