Add:

(i) 5a + 3b, a – 2b and 3a + 5b;

(ii) x³ – x²y + 5xy² + y, –x³ – 9xy² + y, and 3x²y + 9xy².

(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) x³ + (–1+3) x²y + (5–9 +9) xy² + (1+1) y

⇒ 0x³ + 2 x²y +5xy² +2y

⇒ 2 x²y +5xy² +2y