NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.2 are part of NCERT Solutions for Class 7 Maths. Here we have given NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.2.

- Algebraic Expressions Class 7 Ex 12.1
- Algebraic Expressions Class 7 Ex 12.3
- Algebraic Expressions Class 7 Ex 12.4
- Algebraic Expressions Class 7 MCQ

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 7 |

Subject |
Maths |

Chapter |
Chapter 12 |

Chapter Name |
Algebraic Expressions |

Exercise |
Ex 12.2 |

Number of Questions Solved |
6 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.2

**Question 1.**

Simplify combining like terms:

- 21b – 32 + 7b – 20b
- – z
^{2}+ 13z^{2}– 5z + 7z^{3}– 15z - p – (p – q) – q – (q – p)
- 3a – 2b – ab – (a – b + ab) + 3ab + b – a
- 5x
^{2}y – 5x^{2}+ 3yx^{2}– 3y^{2}+ x^{2}– y^{2}+ 8xy^{2}– 3y^{2} - (3y
^{2}+ 5y – 4) – (8y – y^{2}– 4).

**Solution:
**

**Question 2.**

Add:

**Solution:
**

**Question 3.**

Subtract:

- -5y
^{2}from y^{2} - 6xy from – 12xy
- (a – b) from (a + b)
- a (b – 5) from b (5 – a)
- -m
^{2}+ 5mn from 4m^{2}– 3mn + 8 - -x
^{2}+ 10x – 5 from 5x – 10 - 5a
^{2}– 7ab + 5b^{2}from 3ab – 2a^{2}– 2b^{2} - 4pq – 5q2 – 3p2 from 5p2 + 3q2 – pq.

**Solution:
**

**Question 4.**

**(a)** What should be added to x^{2} + xy + y^{2} to obtain 2x^{2} + 3xy?

**(b)** What should be subtracted from 2a + 8b + 10 to get -3a + 76 + 16?

**Solution:
**

**Question 5.**

What should be taken away from 3x^{2} – 4y^{2} + 5xy + 20 to obtain -x^{2} – y^{2} + 6xy + 20?

**Solution:
**

**Question 6.**

**(a)** From the sum of 3x – y + 11 and – y – 11, subtract 3x – y – 11.

**(b)** From the sum of 4 + 3x and 5 – 4x + 2x^{2}, subtract the sum of 3x^{2} – 5x and -x^{2} + 2x + 5.

**Solution:
**

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