(x+y-3)(x+y+3) = x^2+xy+3x+xy+y^2+3y-3x-3y-9 = -9+x^2+y^2+2xy
( x + y − 3 ) ( x + y + 3 ) = ( x + y ) 2 − 9 = x 2 + 2 x y + y 2 − 9
To multiply ( x + y − 3 ) ( x + y + 3 ) , we use the difference of squares formula. This simplifies to ( x + y ) 2 − 3 2 , resulting in x 2 + 2 x y + y 2 − 9 .
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jawaban : beberapa opsi bisa dijadikan desimal- 0,9 -0,87-0,870