Answer: B² - 1
Step-by-step explanation:
We can use the formula for the area of a rectangle to solve this question. A is the area, L is the length, and W is the width.
A = LW
We will substitute known values.
A = (B + 1)(B - 1)
Next, we can multiply this out. This is the difference of squares pattern, there is no middle term.
A = B*B + -1*B + 1*B + -1*1
A = B² - 1
The rectangle's area can be expressed with the expression B² - 1.
