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(x-3)(x+3)-(x+3)^ +3(2x+7)

Răspuns :

(x-3)(x+3)-(x+3)² +3(2x+7)=
x
²-9-(x²+6x+9)+6x+21=
x²-9-x²-6x-9+6x+21=
-9-6x-9+6x+21=
-9-9+21=3
x²-9-x²-6x-9+6x+21=
21-18=
3