x³ - 5x² + 5x - x = 0
x³ - 5x² + 4x = 0
x(x² - 5x + 4) = 0
x(x² - x - 4x + 4) = 0
x[(x² - x) - (4x - 4)] = 0
x[x(x - 1) - 4(x - 1)] = 0
x(x - 1)(x - 4) = 0
x = 0 hoặc x - 1 = 0 hoặc x - 4 = 0
*) x - 1 = 0
x = 1
*) x - 4 = 0
x = 4
Vậy x = 0; x = 1; x = 4
Bài 2 Phân tích thành nhân tử
a) 3x2 – 7x – 10
b) x2 + 6x +9 – 4y2
c) x2 – 2xy + y2 – 5x + 5y’
d) 4x2 – y2 – 6x + 3y
e) 1 – 2a + 2bc + a2 – b2 – c2
f) x3 – 3x2 – 4x + 12
g) x4 + 64
h) x4 – 5x2 + 4
i) (x+1)(x+3)(x+5)(x+7) + 16
j) (x2 + 6x +8)( x2 + 14x + 48) – 9
k) ( x2 – 8x + 15)(x2 – 16x + 60) – 24x2
l) 4( x2 + 15x + 50)(x2 +18x +72) – 3x2
Bài 3 tìm gtnn
A = 9x2 – 6x + 2
B = 4x2 + 5x + 10
C = x2 – x + 10
D = 4x2 + 3x + 20
E = x2 + y2 – 6xy + 10y + 35
F= x2 + y2 – 6x + 4y +2
M= 2x2 + 4y2 – 4xy – 4x – 4y +2021
Bài 7. Tìm x,biết:
a) x-3x2=0 e) 5x(3x-1)+x(3x-1)-2(3x-1)=0
b) (x+3)2-x(x-2)=13 c) (x-4)2-36=0
d) x2-7x+12=0 g) x2-2018x-2019=0
Bài 8. Tìm x, biết
a) (2x-1)2=(x+5)2 b) x2-x+1/4
c) 4x4-101x2+25=0 d) x3-3x2+9x-91=0
Bài 1: Phân tích đa thức thành nhân tử
a) a/ x2 – 2x
b) 2bx – 3ay – 6by + ax
c) x3 +2x2y + xy2 – 4x
d) 4 - x2 – 2xy – y2
đ) 5x2 + 3(x + y)2 – 5y2
e/ 6x2y – 9x
b/ 4x3 – 4x2y + xy2 – 16 x
f) x2 + (2x +y)y – z2
1) Tìm x, y, z
a) 9x2 +y2 + 2z2 – 18x +4z – 6y +20 = 0
b) 5x2 +5y2 +8xy+2y – 2x+2 = 0
c) 5x2 +2y2 + 4xy – 2x + 4y +5 = 0
d) x2 + 4y2 + z2 =2x + 12y – 4z – 14
e) x2 +y2 – 6x + 4y +2= 0
2) Phân tích đa thức thành nhân tử
a) 3xy2 – 3x3 – 6xy +3x
b) 3x2 + 11x + 6
c) –x3 – 4xy2 + 4x2y +16x
d) xz – x2 – yz +2xy – y2
e) 4x2 – y2 – 6x + 3y
f) X4 – x3 – 10x2 + 2x +4
g) (x3 – x2 + x)(121 – 25y2 – 10y) – (x3 – x2 + x) – (121 – 25y2 – 10y) +1
h) X4 – 14x3 + 71x2 – 154x + 120
Giúp mik với mik đang cần rất gấp ạ!!!
tìm x biết
d) 9x^ 2 + 6x - 8 = 0.
e) x(x - 2) + x - 2 = 0;
f) 5x(x - 3) - x + 3 = 0
tìm x
x6 +2x3+1=0
x(x-5)=4x-20
x4-2x2=8-4x2
(x3-x2)-4x2+8x-4=0
Bài 10. Tìm x, biết
a) (x+2)2-x(x+3)+5x=-20 c) (x2-1)3-(x4+x2+1)(x2-1)=0
b) 5x3-10x2+5x=0 d) (x+1)3-(x-1)3-6(x-1)2=-19
Tìm x biết:
a) 2x2 - 3x - 2 = 0.
b) 3x2 - 7x - 10 = 0.
c) 2x2 - 5x + 3 = 0.
tìm x
a)5x(4x-3)+6-8x=0
b)5x(x-9)-x+9=0
a, 5x - 20x2 = 0 c, x.(x-3)- 5x +15 = 0 giải nhanh giúp mình nhoa mình cảm ơn trc
