Tìm x biết:
a) (x - 3)2 - 5.(x - 2) + 5 = 0.
b) (2x - 1)2 - 3.(x - 2).(x + 2) - 25 = 0.
c) (x - 1)3 - x2.(x - 2) + 5 = 0.
d) x2 - 4x + 5 = 0.
a) x2(x-2)2-(x-2)^2 - x2 +1 b) x3-4x2+8x-8
c)1+6x-6x2-x3
d)x3-y3-3x2+3x-1
e)(x+y+z)^3-x3-y3-z3
Tìm x biết:
a) 2x2 - 3x - 2 = 0.
b) 3x2 - 7x - 10 = 0.
c) 2x2 - 5x + 3 = 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
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
Tìm x biết:
a) x2 + 3x - 4 = 0.
b) x2 - 2x - 1 = 0.
Bài 2: tìm x
a) 3x2-x=0
b) x2-25x=0
c) 7x2+2x=0
d) 4x(x-2007)-x+2007
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
a/x^3+3x^2+3x+2=0
b/x^4-2x^3+2x-1=0
c/x^4-3x^3-6x^2+8x=0