Question

plz ans the 3 question its mcq type... pls help me...​

Answer 1

Answer:

Option b

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Answer 2

27x3 + y3 + z3 - 9xyz
= (3x)3 + y3 + z3 - 3 × (3x) × y × z

[Since a3+b3+c3-3abc=g (a + b + c )(a2 + y2 + z2 - ab−bc−ca)]

= [3x + y + z ][(3x)2 + y2 + z2 - (3x) × y − y × z − z(3x)]
= [3x + y + z ][9x2 + y2 + z2 - 3xy − yz − 3zx] both are factor
3x+y+z is a factor

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