Problem 13 of 35alg-013
Which of the following expressions is equivalent to ?
Try it first
The walkthrough opens once you check an answer.
Solution walkthrough1:32
- Think of as the area of a rectangle with sides and .
- Split it into four parts. Each part is one term times one term: , , and .
- The whole area is the four parts added together: .
- Combine the like terms: . The product is .
- Traps: leaving out the two middle parts, adding instead of multiplying, or writing as .