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Question

Which of the following polynomials is/are a polynomial in two variables?
  1. 3x + y
  2. 3x2 + 2x
  3. 3xy + y2
  4. y2 + 2y + 1


Solution

The correct options are
A 3x + y
C 3xy + y2
3x + y contains two variables; x and y in its expression

3x2 + 2x contains only one variable i.e x in its expression.

3xy + y2 contains two variables x and y in its expression

y2 + 2y + 1 contains only one variable i.e y in its expression.

  3xy + y2 and 3x + y are the required answers

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