plzzzzzzzzzzzzzzzzzzzzz (ii)
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I hope it will be correct
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нєℓℓσ мαтє!
(i) 25x² + 9y² + 9z² - 30xy - 18xz + 30xz
( a + b + c )² = a² + b² + c² + 2( ab + bc + ca )
( 5x )² + ( - 3y )² + ( 3z )² - 2[ ( 5x )( - 3y ) + ( - 3y )( 3z ) + ( 3z )( 5x ) ]
= ( 5x - 3y + 3z )²
(ii) 9x² + 16y² + 4z² - 24xy + 16yz - 12xz
( - 3x )² + ( 4y )² + ( 2z )² + 2[ ( - 3x )( 4y ) + ( 4y )( 2z ) + ( 2z )( - 3x ) ]
= ( - 3x + 4y + 2z )²
нσρє ιт нєℓρѕ
(i) 25x² + 9y² + 9z² - 30xy - 18xz + 30xz
( a + b + c )² = a² + b² + c² + 2( ab + bc + ca )
( 5x )² + ( - 3y )² + ( 3z )² - 2[ ( 5x )( - 3y ) + ( - 3y )( 3z ) + ( 3z )( 5x ) ]
= ( 5x - 3y + 3z )²
(ii) 9x² + 16y² + 4z² - 24xy + 16yz - 12xz
( - 3x )² + ( 4y )² + ( 2z )² + 2[ ( - 3x )( 4y ) + ( 4y )( 2z ) + ( 2z )( - 3x ) ]
= ( - 3x + 4y + 2z )²
нσρє ιт нєℓρѕ
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