`(x^2 + 3)(x-3) + 3(x-3) = 0`
`-> (x^2+6)(x-3) = 0`
Vì `x^2 >= 0 -> x^2 + 6 >= 6 > 0`.
`-> x - 3 = 0 -> x= 3`
`(x^2 + 3)(x-3) + 3(x-3) = 0`
`-> (x^2+6)(x-3) = 0`
Vì `x^2 >= 0 -> x^2 + 6 >= 6 > 0`.
`-> x - 3 = 0 -> x= 3`
tìm x
a, (x+3)^2 -x^2 +9 = 0
b, (x-2) (x^2+2)+(2-x)3x = 0
Tìm x:
a, 4x2-25-(2x-5)(2x+7)=0
b, x3+27+(x+3)(x-9)=0
c,2x3+3x2+2x+3=0
Tìm x,biết:a)3x(x-1)+(x-1)=0. b)x^3+27+(x+3)(x-9)=0
Tìm x biết :
a) 3x(x-1)+x-1=0
b) (x-2)(x2+2x+7+2(x2-4)-5(x-2)=0
c) (2x-1)2-25=0
d) x3+27+(x+3)(x-9)=0
Bài 1: Tìm x biết a) x^3 - 4x^2 - x + 4= 0 b) x^3 - 3x^2 + 3x + 1=0 c) x^3 + 3x^2 - 4x - 12=0 d) (x-2)^2 - 4x +8 =0
Gpt: a, x4 - 5x3 + 2x2 + 10x + 2 = 0
b, 2x4 + 5x3 + x2 + 5x + 2 = 0
c, 4x4 - 3x3 - 14x2 + 18x + 9 = 0
d, 3x4 + x3 - 7x2 + 2 = 0
Tìm x
a,x3-4x2-9x+36=0
b,5x2-4(x2-2x+1)-5=0
c,(x2-9)2-(x-3)=0
d,x3-3x+2=0
Bài 2 : Tìm x
a. 4x( x-2) +x - 2 =0
b. ( 3x - 1 )2 - 9 = 0
c. x3 - 8 + ( x- 2) ( x+ 1 )=0
Bài 2 : Tìm x biết
a. 4x( x - 2 ) + x -2 = 0
b. ( 3x-1)2 - 9 = 0
c. x3 - 8 + ( x -2 ) ( x + 1 ) = 0
Tìm x, biết:
a) x. (2x - 7) - 4x + 14 = 0
b) x2. (x - 1) - 4x + 4 = 0
c) x + x2 - x3 - x4 = 0
d) 2x3 + 3x2 + 2x + 3 = 0
e) 4x2 - 25 - (2x - 5). (2x + 7) = 0
g) x3 + 27 + (x + 3). (x - 9) = 0