\(-2x^2-4+6x=0\\ \Leftrightarrow-2\left(x^2-3x+2\right)=0\\ \Leftrightarrow x^2-3x+2=0\\ \Leftrightarrow x^2-x-2x+2=0\\ \Leftrightarrow x\left(x-1\right)-2\left(x-1\right)=0\\ \Leftrightarrow\left(x-1\right)\left(x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
Vậy pt có tập nghiệm \(S=\left\{1;2\right\}\)
a) -x^4+2x^3-2x^2+2x-3=0
b) x^3-6x^2+11x-12=0
7)(16-8x)(2-6x)=0
8) (x+4)(6x-12)=0
9) (11-33x)(x+11)=0
10) (x-1/4)(x+5/6)=0
11) (7/8-2x)(3x+1/3)=0
12)3x-2x^2=0
Bài 4: Tìm x, biết.
a) 4x(x - 7) - 4x2 = 56
b) 12x(3x - 2) - (4 - 6x) = 0
c) 4(x - 5) - (5 - x)2 = 0
d) x(x +1) - x(x - 3) = 0
e) - 6x + 8 = 0 f) 2 + 2x + = 0
tìm x biết: 2x^4-6x^3+x^2+6x-3=0
(x^2-1/2x):2x-(3x-1)^2.(3x-1)=0
(4x^4 + 3x3) : (-x^3) + (15x2 + 6x) : 3x =0
Tìm x
2x^4-6x^3+x^2+6x-3=0
Tìm x:
a) x^2-4x-7=0
b) x^2-x-11=0
c) 2x^4-6x^3+x^2+6x-3=0
tìm x
x^3 -2x^2+x-2=0
2x(3x-5)=10-6x
4-x=2(x-4)^2
4-6x+x(3x-2)=0
