Answer :

i. 2x^{2} + 3x + 5 and 3x^{2} - 4x -7

**Column method of addition**

5 - x -2

ii. -2 x -3 and + 3x + 1

**Column method of addition**

+ x -2

iii. + t -4 and

**Row method of addition**

( + t -4) + ()

Now combine the like terms

= () + (t-3t) + (-4 + 1)

= - 2t - 3

iv. xy - yz, yz - xz and zx - xy

(xy-yz) + (yz-xz) + ( zx-xy)

Now combine the like terms

= (xy-xy) + (-yz + yz) + ( -xz + zx)

= 0 + 0 + 0

= 0

V. + , + , + and 2ab + 2bc + 2ca

Observe we have written the term- of the second polynomial below the corresponding term of the first polynomial. Since the term in the second polynomial and the term 2ab + 2bc + 2ca in the fourth polynomial do not exist, so their respective places have been left blank to facilitate the process of addition.

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