Tìm x biết

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Bài 9: Tìm x biết
1) \( x^2 - 9 = 0 \)
2) \( 25 - x^2 = 0 \)
3) \( -x^2 + 36 = 0 \)
4) \( 4x^2 - 4 = 0 \)
5) \( 4x^2 - 36 = 0 \)
6) \( 4x^2 - 36 = 0 \)
7) \( (3x + 1)^2 - 16 = 0 \)
8) \( (2x - 3)^2 - 49 = 0 \)
9) \( (2x - 5)^2 - x^2 = 0 \)
10) \( (x + 3)^2 - x^2 = 45 \)
11) \( (5x - 4)^2 - 49x^2 = 0 \)
12) \( 16(x - 1)^2 - 25 = 0 \)