Question

(3x+y+z) (3x-y+z) please help me with the sum

Answer 1

Heya !

Here's your answer !!

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( 3x + y + z ) ( 3x - y + z )

=> 3x ( 3x - y + z ) + y ( 3x - y + z ) + z ( 3x - y + z )

=> ( 9x² - 3xy + 3xz ) + ( 3xy - y² + yz ) + ( 3xz - yz + z² )

=> 9x² - 3xy + 3xz + 3xy - y² + yz + 3xz - yz + z²

=> 9x² - 3xy + 3xy + 3xz + 3xz - y² + yz - yz + z²

=> 9x² + 6xz - y² + z²


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Thanks !!

Answer 2

9x2-3xy+3xz+3xy-y2+yz+3xz-zy+z2=9x2-y2+z2+6xz