2. Which of the following expression is a polynomial in one variable?
(a) 3x² –2y + 3
(b) –x² + 6x – 5 = 0
(c) x² + y² = –3
(d) 2x² – 2y–1 = 0

3. Which of the following expression is a polynomial in two variable?
(a) x² – 2xy + y² – x + y
(b) x³ + y³ + z³ –1
(c) x² + 3x + 2
(d) x² – 2x² + 3x + 5

4. The degree of the polynomial 2x³ – 5x² + x – 3 is
(a) 2
(b) 3
(c) 1
(d) 0

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