a, (x+2)2-2x(2x+3) = (x+1)2
x2+4x+22-4x2-6x = x2+2x+1
x2+4x+4-4x2-6x-x2-2x-1 = 0
4x2+4x-3=0
4x2-2x+6x-3=0
2x(2x-1)+3(2x-1)=0
(2x-1)(2x+3)=0
=> 2x-1 = 0 hoặc 2x+3 = 0
<=> x=1/2 hoặc x= -3/2
Vậy x=1/2 và x=-3/2
Tìm x
a,(x+2)2-2x(2x+3)=(x+1)2
b,6x3+x2=2x
c,x8-x5+x2-x+1=0
a) (3x3 — 2x2 + x +2).(5x2)
b) 3x4(-2x3+5x2-2/3x+1/3)
c) (2x —3)(x2 + 2x — 4)
d) (x -3)(x +7)-(x+5)(x-1)
help plssssss
Bài 1: Tìm x
a) (x+2)(x2-2x+4)+(x+2)2=0
b) 9x2-4-(3x-2)2=0
Phân tích các đa thức sau thành nhân tử:
1) x3 - 7x + 6
2) x3 - 9x2 + 6x + 16
3) x3 - 6x2 - x + 30
4) 2x3 - x2 + 5x + 3
5) 27x3 - 27x2 + 18x - 4
6) x2 + 2xy + y2 - x - y - 12
7) (x + 2)(x +3)(x + 4)(x + 5) - 24
8) 4x4 - 32x2 + 1
9) 3(x4 + x2 + 1) - (x2 + x + 1)2
10) 64x4 + y4
11) a6 + a4 + a2b2 + b4 - b6
12) x3 + 3xy + y3 - 1
13) 4x4 + 4x3 + 5x2 + 2x + 1
14) x8 + x + 1
15) x8 + 3x4 + 4
16) 3x2 + 22xy + 11x + 37y + 7y2 +10
17) x4 - 8x + 63
3. Tìm x, biết:
a) x3 - 1/9 = 0
b) 2x - 2y - x2 + 2xy - y2 = 0
c) x(x -30 = x - 3 = 0
d) x2 ( x - 3) + 27 - 9x = 0
a) x(2x - 1) - (x - 2)(2x + 3) = 5
b) (x - 3)2 - 25 = 0
c) (x - 1) (2 - x) + (x + 3)2 = 4 - 2x
(x+2)(x2+2x+7)+2(x2-4)-5(x-2)=0
giải phương trình sau
a,10x+1/7=7x-2/4
B,X2/4-x-4/3=(2X-1)2 -(x2-15) /12
Bài 9 : Tìm x, biết :
a, ( x-2 ) ( x-3 ) + ( x-2 ) - 1 = 0
b, ( x+2 )^2 - 2x ( 2x + 3 ) = ( x+1 )^2
c, 6x^3 + x^2 = 2x
d, x^8 - x^5 + x^2 - x + 1 = 0
Giúp mk vs ạ mk đang cần gấp ạ
Tìm x:
a) x^3 - 25x = 0
b) (2x + 3)^2 = (x+4)^2
c) (2x-1)^2 - (2x-5)(2x+5) = 18
d) x^3 - 8 = (x-2)^3
