Identity arithmetic

Exercise and reference answers

Questions

1. Answer

   200

   Question

   Value of 51 squared minus 49 squared

2. Answer

   12

   Question

   Constant term in (x + 3)(x + 4)

3. Answer

   7

   Question

   Coefficient of x in (x + 3)(x + 4)

4. Answer

   2

   Question

   Common factor of 50, 60 and 18

Instructions

Type the number only.

Explanation