Answer :

(i) 3a2b, -4a2b, 9a2b

= 3a2b + (-4a2b) + 9a2b


= 3a2b – 4a2b + 9a2b


= 3a2b


(ii)


= a + a - a


Taking L.C.M 3, 5 , 5 is 15


=11


=


=


(iii)


= 4xy2 – 7x2y + 12x2y – 6xy2 – 3x2y + 5xy2


= 4x2 + 12x2y – 3x2y – 7x2y – 6xy2 + 5xy2


= 3xy2 + 2x2y


(iv)


Adding all, we get


=


= + +


= - +


(v)


Adding all, we get


= xy + y + + y - - xy


= + +


= - -


(vi)


Adding all, we get


= x3 - x2 + + x3 + x2 – x + + x2 - x – 2


= x3 + x2 - +


= 5x3 + x2 -


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