\(x^2-x-12=0\)
\(\Rightarrow x^2+3x-4x-12=0\)
\(\Rightarrow x\left(x+3\right)-4\left(x+3\right)=0\)
\(\Rightarrow\left(x-4\right)\left(x+3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-4=0\\x+3=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=4\\x=-3\end{matrix}\right.\)
Tìm x, biết:
2(x + 3) – x2 – 3x = 0
tìm x biết
(x-1)2-1+x2-(1-x)(x+3)=0
Tìm x, biết x(x - 4) - (x^2 -12) = 0
Tìm x,y,z nguyên biết x²-4xy+5y²+20x-22y+12=0
Bài 1: Tìm x biết a) x^3 - 4x^2 - x + 4= 0 b) x^3 - 3x^2 + 3x + 1=0 c) x^3 + 3x^2 - 4x - 12=0 d) (x-2)^2 - 4x +8 =0
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
x2 – 25 – 7(x – 5) = 0 Tìm x
Tìm x: x2 +3x =0
Tìm x biết:
a) x3 - 7x2 - 9x + 63 = 0
b) x3 - 3x2 + 3x - 1 + 2.(x2 - x) = 0
Tìm x, biết :
a) \(x^3-\dfrac{1}{4}x=0\)
b) \(\left(2x-1\right)^2-\left(x+3\right)^2=0\)
c) \(x^2\left(x-3\right)+12-4x=0\)
