Answer :

(i) 15y2 (2 – 3x)

= 30y2 – 45xy2


Putting x = -1, y = and z =


= 30 ()2 – 45 (-1) ()2


= 30 () + 45 ()


= +


=


=


(ii) -3x (y2+z2)


Putting x = - 1, y = and z =


= - 3 (-1) ()2 – 3 (-1) ()2


= +


= +


=


(iii) z2 (x-y)


Putting x = - 1, y = and z =


z2 (x – y)


= ()2 (-1 - )


= () ()


=


(iv) xz(x+y2)


Putting x = - 1, y = and z =


= (-1)2 () + (-1) ()2 ()


= - ()


=


=


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