pt \(\Leftrightarrow x^2+x-2019x-2019=0\)
\(\Leftrightarrow x\left(x+1\right)-2019\left(x+1\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(x-2019\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-1\\x=2019\end{matrix}\right.\)
Vậy ...
pt \(\Leftrightarrow x^2+x-2019x-2019=0\)
\(\Leftrightarrow x\left(x+1\right)-2019\left(x+1\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(x-2019\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-1\\x=2019\end{matrix}\right.\)
Vậy ...
(x+y+2z)^2+2018x+2019
Phân tích đa thức thành nhân tử
\(x^4+2019x^2+2018x+2019\)
Tìm x biết :
a, 2x ( x - 3 ) = \(\left(3-x\right)^2\)
b, \(x^3-49x=0\)
c, \(\left(x+2\right)^2+x^2-4=0\)
d, \(5x^2-5=4\left(x^2-2x+1\right)\)
e, \(x^2-2018x-2019=0\)
Tìm x, biết:
2(x + 3) – x2 – 3x = 0
tìm x biết
(x-1)2-1+x2-(1-x)(x+3)=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