NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.3 are part of NCERT Solutions for Class 7 Maths. Here we have given NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.3.

- Algebraic Expressions Class 7 Ex 12.1
- Algebraic Expressions Class 7 Ex 12.2
- 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 12.3 |

Number of Questions Solved |
10 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.3

**Question 1.**

If m = 2, find the value of :

- m – 2
- 3m – 5
- 9 – 5m
- 3m
^{2}– 2m – 7 - – 4

**Solution:
**

**Question 2.**

If p = – 2, find the value of :

- 4p + 7
- – 3p
^{2}+ 4p + 7 - – 2p
^{3}– 3p^{2}+ 4p + 7.

**Solution:
**

**Question 3.**

Find the value of the following expressions, when x = – 1 :

- 2x – 7
- – x + 2
- x
^{2}+ 2x + 1 - 2x
^{2}– x – 2.

**Solution:
**

**Question 4.**

If a = 2, b = – 2, find the value of :

- a
^{2}+ b^{2} - a
^{2}+ ab + b^{2} - a
^{2}– b^{2}.

**Solution:
**

**Question 5.**

When a = 0, b = – 1, find the value of the given expressions :

- 2a + 2b
- 2a
^{2}+ b^{2}+ 1 - 2a
^{2}b + 2ab^{2}+ ab - a
^{2}+ ab + 2.

**Solution:
**

**Question 6.**

Simplify the expressions and find the value ifx is equal to 2.

- x + 7 + 4 (x – 5)
- 3 (x + 2) + 5x – 7
- 6x + 5 (x – 2)
- 4 (2x – 1) + 3x + 11.

**Solution:
**

**Question 7.**

Simplify these expressions and find their values if x = 3, a = – 1, b = – 2.

- 3x – 5 – x + 9
- 2 – 8x + 4x + 4
- 3a + 5 – 8a + 1
- 10 – 3b – 4 – 5b
- 2a – 2b – 4 – 5 + a.

**Solution:
**

**Question 8.**

**(i)** If z = 10, find the value of z^{3} – 3(z – 10).

**(ii)** If p = -10, find the value of p^{2} – 2p – 100.

**Solution:
**

**Question 9.**

What should be the value of a if the value of 2x^{2} + x – a equals to 5, when x = 0 ?

**Solution:
**

**Question 10.**

Simplify the expression and find its value when a = 5 and b = – 3 2(a^{2} + ab) + 3 – ab.

**Solution:
**

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