New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Algebraic Expression Self Practice 5B Solution
(1) Add the following monomials.
(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:
very helpful
Not having proper solution
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