Question

Add:
(i) 3mn, -5mn, 8mn, -4mn (
ii) t – 8tz, 3tz, -z, z – t
(iii) -7mn + 5, 12mn + 2, 9mn – 8, -2mn – 3

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Answer 1

Answer: 1] 3mn,−5mn,8mn,−4mn=3mn+(−5mn)+8mn+(−4mn)

=(3−5+8−4)mn=2mn.

Step-by-step explanation:

Answer 2

Answer:

(i) 3mn, -5mn, 8mn, -4mn
= (3 mn) + (-5 mn) + (8 mn) + (- 4 mn)
= (3 – 5 + 8 – 4)mn
= 2mn which is required

(ii) t – 8tz, 3tz – z, z – t
t – 8tz + 3tz – z + z – t
Re-arranging the like terms, we get
t – t – 8tz + 3tz – z + z
⇒ 0 – 5 tz + 0
⇒ -5tz which is required

(iii) -7mn + 5, 12mn + 2, 9mn – 8, -2mn – 3
= -7mn + 5 + 12mn + 2 + 9mn – 8 + (-2mn) – 3
Re-arranging the like terms, we get
-7mn + 12 mn + 9mn – 2 mn + 5 + 2 – 8 – 3
= –9mn + 9mn + 12mn + 7 – 11
= 12 mn – 4 which is required