# New Learning Composite Mathematics Class 7 SK Gupta Anubhuti Gangal Algebraic Expression Chapter 5B Solution

### New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Algebraic Expression Self Practice 5B Solution

(a) 5a, 9a

(b) 7x2, 3x2, x2

(c) 2m2n, 6m2n, -5m2n

(2) Simplify:

(a) – xy2 – xy2 – xy2

(b) abc – abc +  abc

(c) 12xy + 3xy – 4xy

(d) ab – 7ab + 10ab

(e) – 3 – 2m – 4 + 7m

Solution Number 1 & 2:

(3) Arrange in columns (vertical form) and add.

(a) 3a + 7b, 10a + b

(b) 8x + 5, 3x + 10

(c) 2xy – yz, 5xy + 7yz

(d) 7m2 + 9n2 , -4m2 – 2n2

(e) 11x – 6y, 4x + 5y, 7x – 2y

(f) 2x2 + 6x – 9, -5x2 + 7x – 1, 6x2 + 13x + 21

(g) 5a2 + 6ab + 7b2, 6a2 – 2ab + 3b2, -4a2 – ab – 2b2

(4) Add the following without writing in columns (horizontally).

(a) 2a – 4b + 3c, -a + 7b – c

(b) 4m – 5n + 3p, -3m + 3n – 2p

(c) 3ac +5b2, -ac + b2

(d) 4a – b – c + 1, 2a + 4b + 4c – 8

(e) 5x2 + 8x – 4, 3x2 – 4x + 11

(f) 7m + 8n – 3mn, 9n + 7mn – 3m

(5) Simplify:

(a) 14x2 – 2xy + y2 + 5xy – 2y2 + 5 + x2 + 3y2 + 7

(b) 7 – y3 + y + 9y2 + 2y3 + 6 + y2 + 5y – 19y + 3y3 – 2y2 + 15

(c) 2ab – 4a + 3b – 7 + 6a – 11 – 8b + 3ab + 5 – 2ab + a – 4b

Solution Number 3, 4 & 5:

Updated: February 29, 2020 — 3:17 pm