Pick the expansion

Exercise and reference answers

Questions

1. Question

   (a + b)2

   Choices

   1. a2 + 2ab + b2
   2. a2 + b2
   3. a2 - 2ab + b2

   Correct choice

   a2 + 2ab + b2

2. Question

   (a - b)2

   Choices

   1. a2 + 2ab + b2
   2. a2 - 2ab + b2
   3. a2 - b2

   Correct choice

   a2 - 2ab + b2

3. Question

   a2 - b2

   Choices

   1. (a - b)2
   2. (a + b)2
   3. (a + b)(a - b)

   Correct choice

   (a + b)(a - b)

4. Question

   (x + 3)(x + 4)

   Choices

   1. x2 + 7x + 12
   2. x2 + 12x + 7
   3. x2 + 7x + 7

   Correct choice

   x2 + 7x + 12

Instructions

Tap the correct expansion for each expression.

Explanation