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1.

Fill in the blanks :(i) 5 + 4 = ………… and 5x + 4x = ………….(ii) 12 + 18 = ………… and 12x2y + 18x2y = ………….(iii) 7 + 16 = ………….. and 7a + 16b = …………(iv) 1 + 3 = ………… and x2y + 3xy2 = ………..(v) 7 – 4 = …………… and 7ab – 4ab = …………..(vi) 12 – 5 = ………… and 12x – 5y = ……………(vii) 35 – 16 = ………….. and 35ab – 16ba = ………….(viii) 28 – 13 = …………. and 28ax2 – 13a2x = ………….

Answer»

(i) 5 + 4 = 9 and 5x + 4x = 9x

(ii) 12 + 18 = 30 and 12x2y + 18x2y = 30x2y

(iii) 7 + 16 = 23 and 7a + 16 b = 7a + 16b

(iv) 1 + 3 = 4 and x2y + 3xy2 = x2y + 3xy2

(v) 7 – 4 = 3 and 7ab – 4ab = 3ab

(vi) 12 – 5 = 7 and 12x – 5y = 12x – 5y

(vii) 35 – 16 = 19 and 35ab – 16ba = 19ab

(viii) 28 – 13 = 15 and 28ax2 – 13a2x = 28ax2 – 13a2x
Discussion
2.

Subtract x – 2y – z from the sum of 3x – y + z and x + y – 3z.

Answer»

(3x – y + z) + (x + y – 3 z) – (x – 2y – z)

= 3x – y + z + x + y – 3z – x + 2y + z

= 3x + x – x – y + y + 2y + z + z – 3z

= 3x + 2y – z
Discussion