Question

Помогите : a^2-b^2-6b-9

Answer 1

a^2-b^2-6b-9=(a-b-3)(a+b+3)

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Answer 2

$a^2-b^2-6b-9=a^2-(b^2+6b+9)=a^2-(b+3)^2= \ =(a+(b+3))(a-(b-3))=(a+b+3)(a-b+3)$