Tìm x biết

Tìm x
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6) B = (4x - 3).(4x - 3) + (2x + 1).(8x - 3) + 13(2x - 1)

Bài 6: Tìm x biết

1) x.(x + 3) - x^2 + 9 = 0
2) x.(x - 1) - x^2 + 2x = 5
3) (x + 11) - 2x - x^2 + 12 = 0
4) 5x + (2 - 3).x - 2 = 0
5) x^2 - 2x - 3 = 0
6) x.(3 + 1) - 3x^2 - 2x = 9
7) x.(2x - 3) - 2.(3 - 2x) = 0
8) (x - 5) - 2.(x - 2) = 42
9) 2x - (2 - 5) - (3 + 2x) = 26
10) 2x.(12 - 4) - 9.(4x - 3) = 30

Bài 7: Tìm x biết

1) (x - 2).(x + 3) - x.(x - 2) = 3
2) (x - 1).(x + 1) - x.(2x + 3) + 1 = 0
3) (2x - 1).(x - 2) - (x + 1)! = 0
4) (x - 3).(x - 2) - (x + 1) + x = 5
5) (x - 3).(x - 1) - (2x - 3).(3x - 1) = 0
6) (x - 5).(x + 4) - (x - 1).(x - 1) = 0
7) (x + 2).(x + 3) - (x - 2).(x - 5) = 0
8) (x - 5).(x - 4) - (x - 1).(x + 3) = -2x^2