## EXERCISE 12 A

QUESTION 1

Which of the following expressions are not polynomials ?

(i)

Sol :

Yes , its a polynomial

(ii)

Sol :

[∴ ]

No , its not a polynomial since it contains negative exponent(power)

(iii)

Sol :

Yes , it is a polynomial

(iv)

Sol :

No

(v)

Sol :

No

(vi)

Sol :

No

(vii) 2x^{4}-7x^{2}+5x-2

Sol :

(viii) 45

Sol :

(ix)

Sol :

(x)

Sol :

No

QUESTION 2

Write monomial , binomial , trinomial or polynomial to classify each polynomial and also state their degree :

(i) 5x

Sol :

(ii) 17x^{3}y^{2}z

Sol :

(iii) -11-7x

Sol :

(iv) x^{2 }+ 3x + 7

Sol :

(v)

Sol :

(vi)

Sol :

(vii) y^{4}-3y^{2}+19

Sol :

(viii)

Sol :

QUESTION 3

Arrange the polynomial 4x^{2}y^{2}-7xy^{3}+2x^{4}-3y^{4}+x^{3}y in decreasing degree in x

Sol :

QUESTION 4

Give the degree of each of the following polynomials :

(i) 5x^{3} + 6x^{2} – 3x + 20

(ii) -2x + 9

(iii) x^{2}y^{3} + 5x^{2} – 9xy

(iv) -23

QUESTION 5

Give the degree of each of the following polynomials :

(i) 2πr

(ii) 6x^{2}y^{2}

(iii) -5ab^{2}

(iv)