Multiple choice

Sum of xy, x + y and y + xy is

  1. 2xy + 2x + y

  2. 3xy + 2y

  3. 2xy + x + y

  4. 2xy + x + 2y

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sum the terms: (xy) + (x + y) + (y + xy). Grouping like terms gives (xy + xy) + x + (y + y), which results in 2xy + x + 2y.