Lời giải:
\((x^3-x^2)-4x^2+8x-4=0\)
\(\Leftrightarrow x^2(x-1)-4(x^2-2x+1)=0\)
\(\Leftrightarrow x^2(x-1)-4(x-1)^2=0\)
\(\Leftrightarrow (x-1)[x^2-4(x-1)]=0\)
\(\Leftrightarrow (x-1)(x^2-4x+4)=0\)
\(\Leftrightarrow (x-1)(x-2)^2=0\)
\(\Rightarrow \left[\begin{matrix} x=1\\ x=2\end{matrix}\right.\)
giai phuong trinh
x4 - 5x2 - 2x + 3 = 0
GIAI BAT PHUONG TRINH :
( 2x + 1)( 3 - 2x)( 1 - x) > 0
giai phuong trinh : x4 + 2x3 +5x2 -4x-12=0
Tìm x :
a ) 2(x2+8x+16) -x2+4 = 0
b ) x3-9x2+19x-11=0
giai phuong trinh: b,|x+4|+|3x-6|=4x-3
giai phuong trinh
(x-4)(x-5)(x-6)(x-7)=1680
giai phuong trinh
x4+9=5x(3-x2)
biet rang phuong trinh (x-3a+1)(3x+2a-5)=0 (ala tham songuyen duong) co mot nghiem x=1 . nghiem con lai cua phuong trinh la x=....
tim gia tri cua m,biet rang 1 trong 2 phuong trinh sau day nhan x=-1 lam nghiem,phuong trinh con lai nhan x=5 lam nghiem : (1-x)(x^2+1)=0 va (2x^2+7)(8-mx)=0