# S.chand mathematics solution class 8 chapter 12 Fundamental concept and operations

## 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) 2x4-7x2+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) 17x3y2z

Sol :

(iii) -11-7x

Sol :

(iv) x2 + 3x + 7

Sol :

(v)

Sol :

(vi)

Sol :

(vii) y4-3y2+19

Sol :

(viii)

Sol :

QUESTION 3

Arrange the polynomial 4x2y2-7xy3+2x4-3y4+x3y in decreasing degree in x

Sol :

QUESTION 4

Give the degree of each of the following polynomials :

(i) 5x3 + 6x2 – 3x + 20

(ii) -2x + 9

(iii) x2y3 + 5x2 – 9xy

(iv) -23

QUESTION 5

Give the degree of each of the following polynomials :

(i) 2πr

(ii) 6x2y2

(iii) -5ab2

(iv)

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