Answer :

(i) While adding or subtracting, the like term`s numerical coefficient are added or subtracted

⇒ (5 + 1+ 3)a + (3 – 2 +5) b

⇒ 9 a + 6b

(ii) While adding or subtracting, the like term`s numerical coefficient are added or subtracted

⇒ (1–1) x^{3} + (–1+3) x^{2}y + (5–9 +9) xy^{2} + (1+1) y

⇒ 0x^{3} + 2 x^{2}y +5xy^{2} +2y

⇒ 2 x^{2}y +5xy^{2} +2y

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