Add:
(i) $3 m n, - 5 m n, 8 m n, - 4 m n$
(ii) $t - 8 t z, 3 t z, - z, z - t$
(iii) $- 7 m n, + 5, 12 m n + 2, 9 m n - 8, 2 m n, - 3$
(iv) $a + b - 3, b - a + 3, a - b + 3$
(v) $14 x + 10 y - 12 x y - 13, 18 - 7 x - 10 y + 8 x y, 4 x y$
(vi) $5 m - 7 n, 3 n - 4 m + 2, 2 m - 3 m n - 5$
(vii) $4 x^{2} y, - 3 x y^{2}, - 5 x y^{2}, 5 x^{2} y$

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Solution

(i) $3 m n, - 5 m n, 8 m n, - 4 m n$

Adding we get $3 m n - 5 m n + 8 m n - 4 m n = 2 m n$

(ii) $t - 8 t z, 3 t z, - z, z - t$

Adding we get $t - 8 t z + 3 t z - z + z - t - 5 t z$

(iii) $- 7 m n, 5, 12 m n + 2, 9 m n - 8, 2 m n, - 3$

Adding we get $- 7 m n + 5 + 12 m n + 2 + 9 m n - 8 + 2 m n - 3 = 16 m n - 4$

(iv) $a + b - 3, b - a + 3, a - b + 3$

Adding we get $a + b - 3 + b - a + 3 + a - b + 3 = a + b + 3$

(v) $14 x + 10 y - 12 x y - 13, 18 - 7 x - 10 y + 8 x y, 4 x y$

Adding we get $14 x + 10 y - 12 x y - 13 + 18 - 7 x - 10 y + 8 x y + 4 x y = 7 x + 5$

(vi) $5 m - 7 n, 3 n - 4 m + 2, 2 m - 3 m n - 5$

Adding we get $5 m - 7 n + 3 n - 4 m + 2 + 2 m - 3 m n - 5 = 3 m - 4 n - 3 m n - 3$

(vii) $4 x^{2} y, - 3 x y^{2}, - 5 x y^{2}, 5 x^{2} y$

Adding we get $4 x^{2} y - 3 x y^{2} - 5 x y^{2} + 5 x^{2} y = 9 x^{2} y - 8 x y^{2}$

Suggest Corrections

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Add:

(i) 3mn, − 5mn, 8mn, −4mn

(ii) t − 8tz, 3tz − z, z − t

(iii) − 7mn + 5, 12mn + 2, 9mn − 8, − 2mn − 3

(iv) a + b − 3, b − a + 3, a − b + 3

(v) 14x + 10y − 12xy − 13, 18 − 7x − 10y + 8xy, 4xy

(vi) 5m − 7n, 3n − 4m + 2, 2m − 3mn − 5

(vii) 4x²y, − 3xy², − 5xy², 5x²y

(viii) 3p²q² − 4pq + 5, − 10p²q², 15 + 9pq + 7p²q²

(ix) ab − 4a, 4b − ab, 4a − 4b

(x) x²− y² − 1 , y² − 1 − x², 1− x² − y²

3 m n, - 5 m n, 8 m n, - 4 m n

t - 8 t z, 3 t z - z, z - t

14 x + 10 y - 12 x y - 13, 18 - 7 x - 10 y + 8 x y, 4 x y

Question 2 (v)

Add:

14x + 10y - 12xy - 13, 18 - 7x - 10y + 8xy, 4xy

Question 2 (vi)

Add:

5m - 7n, 3n - 4m + 2, 2m - 3mn - 5

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