2x(x+2)2-8x2=2(x-2)(x2+2x+4)
(=) 2x(x2+4x+4) -8x2=2(x3-8)
(=) 2x3+8x2+8x -8x2 -2x3+16 =0
(=) 8x = -16
(=) x=-2
Vậy S={-2}
Chúc bạn học tốt.
I : PTĐTTNT
A= \(\left(x^2-6x\right)^2-2\left(x-3\right)^2-81\)
B=\(x^4+y^4+z^4-2x^2y^2-2y^2z^2-2x^2z^2\)
help me !!!
(x2+2x-2)2+2(x2+2x-4)=x+2
I : Đặt biến phụ
a) ( x^2+x)^2-14(x^2+x)+24
b) (x^2+x)^2+4x^2+4x-12
c) x^4+2x^3+5x^2+4x-12
help me
I : Tìm x , y
a) x^2+y^2-2x+4y+5=0
b) 4x^2+y^2-4x-6x+10=0
c) 5x^2-4xy+y^2-4x+4=0
d)2x^2-4xy+4y^2-10x+25=0
help me
I : PTĐTTNT
a) \(\left(x^2-x-2\right)^2+\left(x-2\right)^2\)
b) \(x^4+2019x^2+2018x+2019\)
c) \(x^4+2x^3+5x^2+4x-5\)
help me
I : Tìm giá trị nguyên của x để
a) x^3+3x^2-2x-18 \(⋮\) x-2
b) x^4-3x^2 \(⋮\) x^2-x-1
help me
\(\text{x^2 -2x = 24 }\)
\(\left(x+2\right)^2-9=0\)
tìm x help me :)))
Tìm x biết :
\(\left(8x^2-2x+7\right)\left(4x-6x^2-3\right)=\left(6x^2+3x+4\right)\left(9x-8x^2-6\right)\)
Help me vs !!
Cho 2xy>x>0 và 3x^2+2y^2=7xy
Tính A=(3x+y)/(7y-x) + (6x-9y)/(2x+y)
help me!!
Tìm x
a)(2x+1)2-4(x+2)2 =9
b)(3x-1)2 +2(x+3)2 +11(x+1)(1-x)=6
c)(x+1)3 - x2 (x+3)=2
d)(x-2)3 -x(x+1)(x-1)+6x2 =5
e)(x-3)(x2 +3x +9)-x(x+4)(x-4)=5
g)(x-2)3 -(x+5)(x2 -5x+25)+6x2 =11
