Questions and Solutions for NCERT Class 7th Mathematics – Chapter 12 – Algebraic Expressions – Exercise – 12.3
1. If m = 2, find the value of:
(i) m – 2 (ii) 3m – 5 (iii) 9 – 5m (iv) 3m^2 – 2m – 7 (v) 5m/2 – 4
2. If p = – 2, find the value of:
(i) 4p + 7 (ii) – 3p^2 + 4p + 7 (iii) – 2p^3– 3p^2 + 4p + 7
3. Find the value of the following expressions, when x = –1:
(i) 2x – 7 (ii) – x + 2 (iii) x^2 + 2x + 1 (iv) 2x^2 – x – 2
4. If a = 2, b = – 2, find the value of:
(i) a^2 + b^2 (ii) a^2 + ab + b^2 (iii) a^2 – b^2
5. When a = 0, b = – 1, find the value of the given expressions:
(i) 2a + 2b (ii) 2a^2 + b^2 + 1 (iii) 2a^2 b + 2ab^2 + ab (iv) a^2 + ab + 2
6. Simplify the expressions and find the value if x is equal to 2
(i) x + 7 + 4 (x – 5) (ii) 3 (x + 2) + 5x – 7 (iii) 6x + 5 (x – 2) (iv) 4(2x – 1) + 3x + 11
7. Simplify these expressions and find their values if x = 3, a = – 1, b = – 2.
(i) 3x – 5 – x + 9 (ii) 2 – 8x + 4x + 4 (iii) 3a + 5 – 8a + 1 (iv) 10 – 3b – 4 – 5b (v) 2a – 2b – 4 – 5 + a
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
9. What should be the value of a if the value of 2x^2 + x – a equals to 5, when x = 0?
10. Simplify the expression and find its value when a = 5 and b = – 3.
2(a^2 + ab) + 3 – ab
You can find the solutions for previous exercise from here
- Chapter 12 -Algebraic Expressions – Exercise – 12.2
- Algebraic Expressions – Exercise – 12.1
- Perimeter and Area – Exercise – 11.4
- Chapter 11 – Perimeter and Area – Exercise – 11.3
- Perimeter and Area – Exercise – 11.2
- Chapter 11 – Perimeter and Area – Exercise – 11.1
- Chapter 10 – Practical Geometry – Exercise -10.5
- Practical Geometry – Exercise -10.4
- Chapter 10 – Practical Geometry – Exercise -10.3
- Practical Geometry – Exercise -10.2
- Chapter 10 – Practical Geometry – Exercise -10.1
- Chapter 9 – Rational Numbers – 9.2
- Rational Numbers – Exercise – 9.1
- Comparing Quantities – Exercise – 8.3
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