Answer :

(i) A quadratic polynomial is a polynomial of degree 2

∵ the degree of 5x^{2} + x – 7 is 2

∴ 5x^{2} + x – 7 is a quadratic polynomial.

(ii) A cubic polynomial is a polynomial of degree 3

∵ the degree of 5x^{2} + x – 7 is 3

∴ 5x^{2} + x – 7 is a cubic polynomial.

(iii) A quadratic polynomial is a polynomial of degree 2

∵ the degree of x^{2} + x + 4 is 2

∴ x^{2} + x + 4 is a quadratic polynomial.

(iv) A linear polynomial is a polynomial of degree 1

∵ the degree of x – 1 is 1

∴ x – 1 is a linear polynomial.

(v) A linear polynomial is a polynomial of degree 1

∵ the degree of 3p is 1

∴ 3p is a linear polynomial.

(vi) A quadratic polynomial is a polynomial of degree 2

∵ the degree of πr^{2} is 2

∴ πr^{2} is a quadratic polynomial.

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