Grade 12th pass9 grade maths
11. Factorise : 27r + y3 + z8 - 9xyz.
11. Factorise : 27r + y3 + z8 - 9xyz.
1 Answer
Pawan Prajapati
SoL Consider ?:1.r3 + y3 + ii - 9xyz
= (Sx)S + C y'jJ + )3 - 3<3xX yXz)
[Using identity:.r3 + y3 + ii - 3%)'%
= (.r + y + z)(r + y2 + z2 -%)' -yz - u)]
POLYNOMALS 43
= (8% + Y + z) 1<8%>2 + y2 + z2 - (8%)y -yz - (8%)z}
= (8% + y + z) <9%2 + y2 + z2 - 3x)i -yz - Su).
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