Tìm x biết:
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9. Tìm x biết:
a) \(4x^2 - 36 = 0; \)
b) \(25x^2 - (3x + 1)^2 = 0; \)
c) \(x^2 + 12x + 36 = 0; \)
d) \(18x^2 + 12x + 2 = 0; \)
e) \(4x^2 - 4x + 1 = 0; \)
f) \(81x^4 - 18x^2 = -1; \)
g) \(x^3 + 6x^2 + 12x + 8 = 0; \)
h) \(8x^3 + 12x^2 + 6x + 2 = 0; \)
i) \(27x^3 - 27x^2 + 9x = 1; \)
j) \(125x^3 - 150x^2 = 9 - 60x; \)
9. Tìm x biết:
a) \(4x^2 - 36 = 0; \)
b) \(25x^2 - (3x + 1)^2 = 0; \)
c) \(x^2 + 12x + 36 = 0; \)
d) \(18x^2 + 12x + 2 = 0; \)
e) \(4x^2 - 4x + 1 = 0; \)
f) \(81x^4 - 18x^2 = -1; \)
g) \(x^3 + 6x^2 + 12x + 8 = 0; \)
h) \(8x^3 + 12x^2 + 6x + 2 = 0; \)
i) \(27x^3 - 27x^2 + 9x = 1; \)
j) \(125x^3 - 150x^2 = 9 - 60x; \)