Tìm x, biết: 9(4x + 3)^2 = 16(3x - 5)^2
Bài 1: Tìm x biết
a) 9(4x + 3)^2 = 16(3x - 5)^2
b) (x3 - x2)^2 - 4x^2 + 8x - 4 = 0
c) x^5 + x^4 + x^3 + x^2 + x + 1 = 0
Bài 2: Tìm x biết
a) 5x^3 - 7x^2 - 15x + 21 = 0
b) (x - 3)^2 = 4x^2 - 20x + 25
c) (x - 1)^2 - 5 = (x + 2)(x - 2) - x(x - 1)
d) (2x - 3)^3 - (2x + 3)(4x^2 - 1) = -24
a) 9(4x + 3)^2 = 16(3x - 5)^2
b) (x3 - x2)^2 - 4x^2 + 8x - 4 = 0
c) x^5 + x^4 + x^3 + x^2 + x + 1 = 0
Bài 2: Tìm x biết
a) 5x^3 - 7x^2 - 15x + 21 = 0
b) (x - 3)^2 = 4x^2 - 20x + 25
c) (x - 1)^2 - 5 = (x + 2)(x - 2) - x(x - 1)
d) (2x - 3)^3 - (2x + 3)(4x^2 - 1) = -24