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Please give the solution for Q.No 17 and 18 with explanation

Please give the solution for Q.No 17 and 18 with explanation 

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Grade:12th pass

1 Answers

Aditya Gupta
2081 Points
4 years ago
note that 
3x^2 + 5y^2 + 4z^2 – 4xy – 4xz – 4x – 2y + 25= (x – 2)^2 + (y – 1)^2 + (x – 2y)^2 + (x – 2z)^2 + 20.
for this  expression to b min, all square terms can be made zero.
so x= 2, y= 1, x= 2z or z= 1.
hence minimum value is 20.
kindly approve :)

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