Question

9x^2-y^2+4y-4 Factorisation

Answer 1

9 x² - y² + 4 y - 4

==> ( 3 x)² - ( y² + 2.y.2 + 2² )

==> ( 3 x)² - ( y - 2 )²     [ ( a + b )² = a² + 2 ab + b² ]

==> ( 3 x - ( y - 2 ) ) ( 3 x + ( y - 2 ) )    [ ( a + b )( a - b ) = a² - b² ]

==> ( 3 x - y + 2 )( 3 x + y - 2 )

This is the answer

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Answer 2

Answer:

> ( 3 x - y + 2 )( 3 x + y - 2 )

Step-by-step explanation:

Brainly User

9 x² - y² + 4 y - 4

==> ( 3 x)² - ( y² + 2.y.2 + 2² )

==> ( 3 x)² - ( y - 2 )²     [ ( a + b )² = a² + 2 ab + b² ]

==> ( 3 x - ( y - 2 ) ) ( 3 x + ( y - 2 ) )    [ ( a + b )( a - b ) = a² - b² ]

==> ( 3 x - y + 2 )( 3 x + y - 2 )