NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities Ex 9.1 are part of NCERT Solutions for Class 8 Maths. Here we have given NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities Ex 9.1.

- Algebraic Expressions and Identities Class 8 Ex 9.2
- Algebraic Expressions and Identities Class 8 Ex 9.3
- Algebraic Expressions and Identities Class 8 Ex 9.4
- Algebraic Expressions and Identities Class 8 Ex 9.5

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 8 |

Subject |
Maths |

Chapter |
Chapter 9 |

Chapter Name |
Algebraic Expressions and Identities |

Exercise |
Ex 9.1 |

Number of Questions Solved |
4 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities Ex 9.1

**Ex 9.1 Class 8 Maths Question 1.**

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

**(i)** 5xyz^{2} – 3zy

**(ii)** 1 + x + x^{2}

**(iii)** 4x^{2}y^{2} – 4x^{2}y^{2}z^{2} + z^{2}

**(iv)** 3 – pq + qr -rp

**(v)** \(\frac { x }{ 2 } +\frac { y }{ 2 } -xy\)

**(vi)** 0.3a – 0.6ab + 0.5b

**Solution:**

**(i)** In the expression 5xyz^{2} – 3zy, the terms are 5xyz^{2} and -3zy.

Coefficient of xyz^{2} in the term 5xyz^{2} is 5.

Coefficient of zy in the term – 3yz is – 3.

**(ii)** In the expression 1 + x + x^{2}, the terms are 1, x and x^{2}.

Coefficient of term 1 is 1.

Coefficient of x in the term x is 1.

Coefficient of x^{2} in the term x^{2} is 1.

**(iii)** In the expression 4x y – 4xyz + z , the terms are 4x^{2}y^{2}, – 4x^{2}y^{2}z^{2} and z^{2}.

Coefficient of x^{2}y^{2} in the term 4x^{2}y^{2} is 4.

Coefficient of x^{2}y^{2}z^{2} in the term – 4x^{2}y^{2}z^{2} is – 4.

Coefficient of z^{2} in the term z2 is 1.

**(iv)** In the expression 3 – pq + qr – rp, the terms are 3, – pq, qr and – rp.

Coefficient of term 3 is 3.

Coefficient of pq in the term – pq is -1.

Coefficient of qr in the term qr is 1.

Coefficient of rp in the term – rp is -1.

**(v)** In the expression \(\frac { x }{ 2 } +\frac { y }{ 2 } -xy\), the terms are \(\frac { x }{ 2 } ,\frac { 7 }{ 2 } \) and – xy.

Coefficient of x in the term \(\frac { x }{ 2 } \) is \(\frac { 1 }{ 2 } \)

Coefficient of y in the term \(\frac { y }{ 2 } \) is \(\frac { 1 }{ 2 } \)

Coefficient of xy in the term – xy is -1.

**(vi)** In the expression 0.3a -0.6 ab + 0.5 b, the terms are 0.3a, – 006ab and 0.5b.

Coefficient of a in the term 0.3a is 0.3.

Coefficient of ab in the term – 0.6ab is – 0.6.

Coefficient of b in the term 0.5b is 0.5.

**Ex 9.1 Class 8 Maths Question 2.**

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

x + y, 1000, x + x^{2} + x^{3} + x^{4}, 7 + y + 5x, 2y – 3y^{2}, 2y – 3y^{2} + 4y^{3}, 5x – 4y + 3xy, 4z – 15z2, ab + bc+cd + da, pqr, p^{2}q + pq^{2}, 2p + 2q.

**Solution:**

The given polynomials are classified as under :

Monomials : 1000, pqr

Binomials : x + y, 2y – 3y^{2}, 4z -15z^{2}, p^{2}q + pq^{2}, 2p + 2q.

Trinomials : 7 + y + 5x, 2y – 3y^{2} + 4y^{3}, 5x – 4y + 3x.

Polynomials that do not fit in any categories :

x + x^{2} + x^{3} + x^{4}, ab + be + cd + da.

**Ex 9.1 Class 8 Maths Question 3.**

Add the following :

**(i)** ab – be, be – ca, ea – ab

**(ii)** a – b + ab, b-c + be, c – a + ac

**(iii)** 2p^{2}q^{2} – 3pq + 4, 5 + 7pq – 3p^{2}q^{2}

**(iv)** l^{2} + m^{2}, m^{2} + n^{2}, n^{2} + l^{2}, 2Im + 2mn + 2nl

**Solution:**

**(i)** Writing the given expressions in separate rows with like terms one below the other, we have

**(ii)** Writing the given expressions in separate rows with like terms one below the other, we have

**(iii)** Writing the given expressions in separate rows with like terms one below the other, we have

**(iv)** Writing the given expressions in separate rows with like terms one below the other, we have

**Ex 9.1 Class 8 Maths Question 4.**

**(a)** Subtract

4a – lab +36 + 12 from 12a – 9a6 + 56-3

**(b)** Subtract

3xy + 5yz – Izx from 5xy – 2yz – 2zx + IQxyz

**(c)** Subtract 4p^{2}q – 3pq + 5pq^{2} – 8p + 7q – 10 from 18 – 3p – 11q + 5pq – 2pq^{2} + 5p^{2}q.

**Solution:**

Rearranging the terms of the given expressions, changing the sign of each term of the expression to be subtracted and adding the two expressions, we get

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