Exercise 6A
Q1 | Ex-6A | Class 7 | Algebraic Expression | S.Chand |Composite Mathematics |Chapter 6 |myhelper
Question 1
Identify Monomials , Binomials and Trinomials from the following express:
(i) 2m+3n
Ans: Binomials
(ii) a- 5b+7c
Ans: Trinomial
(iii) $\frac{2}{7} a^{2}$
Ans: Monomials
(iv) $5 m^{2}-4$
Ans: Binomials
(v) $7 a^{2}+2 b^{2}-4 a b$
Ans: Trinomial
(vi) $\frac{1}{2} x^{3}-y+2$
Ans: Trinomial , Polynomials
Q2 | Ex-6A | Class 7 | Algebraic Expression | S.Chand |Composite Mathematics |Chapter 6 |myhelper
Question 2
Write the coefficient of x in the following:
(i) 2x
Ans: 2
(ii) mx
Ans: m
(iii) -2px
Ans: -2p
(iv) $3 x y^{2}$
Ans: $3 y^{2}$
(v) $-\frac{1}{3} x p$
Ans: $-\frac{1}{3} p$
Q3 | Ex-6A | Class 7 | Algebraic Expression | S.Chand |Composite Mathematics |Chapter 6 |myhelper
Question 3
Write the coefficient of :
(i) $x$ in $-6 x y^{2}$
Ans: $-6 y^{2}$
(ii) $q$ in $q x^{2}$
Ans: $x^{2}$
(iii) a in $\frac{2}{3} a$
Ans: $\frac{2}{3}$
(iv) $x^{2} y$ in $\frac{-4}{9} a$ $x^{2} y$
Ans: $-\frac{4}{9} a$
(v) xy in - 4xyz
Ans: - 4z
(vi) z in -z
Ans: -1
Q4 | Ex-6A | Class 7 | Algebraic Expression | S.Chand |Composite Mathematics |Chapter 6 |myhelper
Question 4
Identify the like terms in each of the following :
(i) $a^{2}, b^{2},2 a^{2}, c^{2}$
Ans: Like terms $a^{2}$ , $2 a^{2}$
(ii) $3 x y, yz, 5 x, \frac{2}{7} y z$
Ans: Like terms yz , $\frac{2}{7} y z$
(iii) $8 m^{2} n, m^{2} p,-m^{2} n, m^{2} n^{2}$
Ans: Like terms $8 m^{2} n$ , $-m^{2} n$
(iv) $c a b^{2}, a^{2} b c, b^{2} a c, c^{2} a b, a b c, a c b^{2}$
Ans: like terms $c a b^{2}$ , $b^{2} a c$ , $a c b^{2}$
Q5 | Ex-6A | Class 7 | Algebraic Expression | S.Chand |Composite Mathematics |Chapter 6 |myhelper
Question 5
identify polynomial from the given algebraic equation
(i) $\frac{4}{9} y^{2}-\frac{4}{9} x^{2}+4$
(ii) $\frac{2}{x}+\frac{3}{x^{2}}-4 x^{2}+3 x+2$
(iii) $3 a^{3}+4 a^{2} b+8 b^{3}$
(iv) $x^{2}-\frac{1}{x^{2}}+2$
Ans: Only I and III are polynomials
Q6 | Ex-6A | Class 7 | Algebraic Expression | S.Chand |Composite Mathematics |Chapter 6 |myhelper
Question 6
Write down the degree of the following polynomials:
(i) $4 x^{2}-x^{4}$
Ans: degree of polynomials = 4
(ii) $4 p^{2}+6 p^{3}+8 p^{8}$
Ans: degree of polynomials = 8
(iii) $m^{2} n^{3}+m n^{2}+4$
Ans: degree of polynomials = 5
( iv) $p^{2} q^{4}+p q^{2}+1$
Ans: degree of polynomials =6
(v) 4
$x^0$= 1
4×1 = $4 \times x^0$
Degree of polynomials =0
No comments:
Post a Comment