x3 - 5x2 + 8x - 4
= x3 - x2 - 4x2 + 4x + 4x - 4
= x2( x - 1) - 4x (x - 1) + 4 (x - 1)
= (x2 - 4x + 4) (x - 1)
= (x - 2)2 (x - 1)
x - 1 = 0
x = 1
(x - 2)2 = 0
x = 2
vậy x = 1
x = 2
tìm x biết x^3+5x^2+8x+4=0
1).(4-3x)(10-5x)=0 2).(7-2x)(4+8x)=0 3).(9-7x)(11-3x)=0
4).(7-14x)(x-2)=0 5).(\(\dfrac{7}{8}\)-2x)(3x+\(\dfrac{1}{3}\))=0 6).3x-2x\(^2\)
7).5x+10x\(^2\)
tìm x: a)x^4-2x^3+5x^2-10x=0
b)(3x+5)^2=(2x-2)^2
. c)x^3–2x^2+x=0
. d)x^2(x-1)-4x^2+8x-4=0
a) (x + 2)(x + 3)- (x- 2)(x + 5) = 0;
b) (2x + 3)(x - 4) + (x- 5)(x- 2) = (3x- 5)(x- 4);
c) (8- 5x)(x + 2) + 4(x- 2)(x + I ) + 2(x- 2)(x + 2) = 0;
d) (8x- 3)(3x + 2)- (4x + 7)(x + 4) = (2x + 1)(5x- I)- 33.
1) a) ( x - 2 ) ( x + 3 )
b) 4x2 - ( 2x - 1 )2
2) a) 4x2 - 8x + 4
b) x2 + 4x - 4y2 + 4
3) a) 5x( x - 3 ) - x -3 = 0
b) 5x2 - 8x - 4 = 0
Làm đi t cho 3 tk lun
Giải phương trình
1)(x-2)(x-1)=x(2x+1)+2
2)(x+2)(x+2)-(x-2)(x-2)=8x
3)(2x-1)(x^3-x+1)=2x^3-3x^2+16=0
4)(8x-3)(3x+2)-(4x+7)(x+4)=(2x+1)(5x-1)
5)(8-5x)(x+2)+4(x-2)(x+1)+2(x-2)(x+2)=0
6)4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
x3-5x2+8x-4=0
giải phương trinh sau
1/ x^2 +7x +6 =0
2/ x^2 +7x +12 =0
3/ x^2 +8x+15 =0
4/ x^2 +5x+4 =0
tìm x
(2x-3)^2-(x+5)^2=0
x*(2x-7)-4x+14=0
x^3-5x^2+8x-4=0
