Question

ADD ;
1. 3mn, -5mn, 8mn, -4mn
2. t-8tz, 3tz-z, z-t​

Answer 1

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$1) \: 3mn + ( - 5mn) + 8mn + ( - 4mn) \\ \\ = 3mn - 5mn + 8mn - 4mn \\ \\ = - 2mn + 8mn - 4mn \\ \\ = 6mn - 4mn \\ \\ = 2mn$

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$2) \: t - 8tz + (3tz - z) + (z - t) \\ \\ = t - 8tz + 3tz - z + z - t \\ \\ = t - t - 8tz + 3tz - z +z \\ \\ = - 8tz + 3tz \\ \\ = - 5tz$

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Answer 2

(i)2mn

(ii)-5tz

explanation:

(i) 3mn + (-5mn) + 8mn + (-4mn)

• = Mn (3-5 + 8 - 4)

= 2mn

(ii) (t - 8tz) + (3tz - z) + (z-t) = t - 8tz + 3tz - z+z-t

• = t - t - 8tz + 3tz - z + z

• =t(1-1) + tz (-8 + 3) + z(-1+1)

= -5tz

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★final Answers

• (i)2mn
• (ii)-5tz