1.

`(x-2y-3z)^(2)` को सरल कीजिए ।

Answer» हम जानते हैं कि
`(x+y+z)^(2)=x^(2)+y^(2)+z^(2)+2xy+2yz+2zx`
`therefore" "(x-2y-3z)^(2)=(x)^(2)+(-2y)^(2)+(-3z)^(2)+2(x)(-2y)+2(-2y)(-3z)+2(-3z)(x)`
`= x^(2) + 4y^(2) + 9z^(2) - 4xy + 12yz - 6xz`


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