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1) x^{2} – 9
= ( – )( + )
2) x^{2} – 16
( – ) ( + )
3) x^{2} – y^{2}
= ( – )( + )
4) x^{2} – 100
= ( – )( + )
5) 1 – x^{2}
= ( – )( + )
6) x^{2} – 1
= ( – )( + )
7) 49 – x^{2}
= ( – )( + )
8) x^{2} – 36
= ( – )( + )
9) x^{2} – 25
= ( – ) ( + )
10) x^{2} – 81
= ( – ) ( + )