Q. 16

Multiply:

(i) x2+y2+z2-xy+xz+yzbyx+y-z

(ii) x2+4y2+z2+2xy+xz-2yzbyx-2y-z

(iii) x2+4y2+2xy+-3x+6y+9byx-2y+3

(iv) 9x2+25y2+15xy+12x-20y+16by3x-5y+4

Answer :

(i) Given,


=


Multiply the above expression by ( x+ y – z)


=


=


=


=


(ii) Given,


=


Multiply above expression by (x-2y-z)


Then ,


=


=


By formula…


=


iii) we have


=


(iii) Given,


=


Multiply above equation by ( x- 2y +3 )


=


=


=


=


(iv) Given,


=


Multiply above equation by (3x – 5y +4)


We got,


=


=


=


=


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