Answer :

Given problem asks to subtract

(i) –2xy + 3xy^{2} from 8xy

⇒ 8xy – ( –2xy + 3xy^{2} )

⇒ 8xy +2xy –3xy^{2}

⇒ 10xy –3xy^{2}

(ii) a – b – 2c from 4a + 6b – 2c

⇒ 4a +6b –2c – (a– b – 2c)

⇒ 4a +6b –2c –a + 2c +b

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

⇒ (4–1) a + (6 +1) b +( –2 +2) c

⇒ 3a +7b

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