plz ans the 3 question its mcq type... pls help me...
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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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= (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
Hopefully it’s helpful for you
Please mark me as a brainliest
Thanks
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