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

(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,

= = = = Rate this question :

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