Answer :

(i) -5xy from 12xy

After subtracting,we get


= 12xy - (- 5xy)


= 5xy + 12xy


= 17xy


(ii) 2a2 from -7a2


After subtracting, we get


= 2a2 + (-7a2)


= -2a2 + 7a2


= -9a2


(iii) 2a-b from 3a-5b


After subtracting, we get


= -(2a – b)+ (3a – 5b)


= -2a + b+ 3a – 5b


= a – 4b


(iv)


After subtracting, we get


= - (2x3 – 4x2 + 3x + 5) + (4x3 + x2 + x + 6)


= - 2x3 + 4x2 – 3x – 5 + 4x3 + x2 + x + 6


= 2x3 + 5x2 – 2x + 1


(v)


After subtracting, we get


= y2 + y2 + y – 2 - y3 + y2 + 5


= y3 + y2 + y + 3


= y3 + y2 + y + 3


(vi)


After subtracting, we get


= x + y - z – (x - y - z)


= x - x + y + y - z + z


= + +


= + +


(vii) x2 - xy2 + xy from x2y + xy2 - xy


= x2y + xy2 - xy – (x2 - xy2 + xy)


= x2y – x2y + xy2 + xy2 - xy - xy


= x2y + xy2 - xy


(viii)


After subtracting, we get


= bc - ac – ( - bc + ac)


= bc + bc - ac - ac -


= + -


= + -


= - -


= – 2ac -


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