# Multiply the mono

(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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