Question

NCRT maths book class 8th ch -14 ex-14.2 Q-1and 2 ​

Answer 1

1. x2+ 10x + 25

x2 + (5+5)x + 25

x2 + 5x + 5x + 25

x(x+5) + 5(x+5)

(x+5)(x+5)

2.

x2- 12x + 36

x2 - (6+6)x + 36

x2 - 6x - 6x + 36

x(x-6) - 6(x-6)

(x-6)(x-6)

Answer 2

Answer:

1. Identify the terms, their coefficients for each of the following expressions:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

Ans. (i) Terms: and

Coefficient in is 5 and in is

(ii) Terms: and

Coefficient of and coefficient of is 1.

(iii) Terms: and

Coefficient in is 4, coefficient of is and coefficient of is 1.

(iv) Terms: and

Coefficient of is , coefficient of is 1 and coefficient of is

(v) Terms: and

Coefficient of is coefficient of is and coefficient of is

(vi) Terms: and

Coefficient of is 0.3, coefficient of is and coefficient of is 0.5.

NCERT Solutions for Class 8 Maths Exercise 9.1

2. Classify the following polynomials as monomials, binomials, trinomials. Which polynomials do not fit in any of these three categories:

Ans. (i) Since contains two terms. Therefore it is binomial.

(ii) Since 1000 contains one terms. Therefore it is monomial.

(iii) Since contains four terms. Therefore it is a polynomial and it does not fit in above three categories.

(iv) Since contains three terms. Therefore it is trinomial.

(v) Since contains two terms. Therefore it is binomial.

(vi) Since contains three terms. Therefore it is trinomial.

(vii) Since contains three terms. Therefore it is trinomial.

(viii) Since contains two terms. Therefore it is binomial.

(ix) Since contains four terms. Therefore it is a polynomial and it does not fit in above three categories.

(x) Since contains one terms. Therefore it is monomial.

(xi) Since contains two terms. Therefore it is binomial.

(xii) Since contains two terms. Therefore it is binomial.