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(-2,2) (-2,2] (-∞,2] (-∞,-2)
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(a-1)(a-2)=a2-3a+2 a2-3a+2=(a-1)(a-2) (a-1)2+(a-1)=a2-a a2-3a+2=(a-1)2-(a-1)
a(a-4) (a+2)(a-2) a(a+2)(a-2) (a-2)2-4
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a(a-4) (a+2)(a-2) a(a+2)(a-2) (a-2)2-4
a(a2-4) a(a-2)2 a(a+2)(a-2) (a2+2a)(a-2)