\(\left(x-4\right)^2-3=0\)
\(\Leftrightarrow\left(x-4\right)^2=3\)
\(\Leftrightarrow\left[{}\begin{matrix}x-4=\sqrt{3}\\x-4=-\sqrt{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4+\sqrt{3}\\x=4-\sqrt{3}\end{matrix}\right.\)
\(\left(x-4\right)^2-3=0\)
\(\Leftrightarrow\left(x-4\right)^2=3\)
\(\Leftrightarrow\left[{}\begin{matrix}x-4=\sqrt{3}\\x-4=-\sqrt{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4+\sqrt{3}\\x=4-\sqrt{3}\end{matrix}\right.\)
tìm x biết x + x^2 - x^3 - x^4 = 0
Bài 7. Tìm x,biết:
a) x-3x2=0 e) 5x(3x-1)+x(3x-1)-2(3x-1)=0
b) (x+3)2-x(x-2)=13 c) (x-4)2-36=0
d) x2-7x+12=0 g) x2-2018x-2019=0
Bài 8. Tìm x, biết
a) (2x-1)2=(x+5)2 b) x2-x+1/4
c) 4x4-101x2+25=0 d) x3-3x2+9x-91=0
tìm x biết
a) x^ 3 + x ^2 + x + 1 = 0;
b) x^ 3 - x^ 2 - x + 1 = 0;
c) x^ 2 - 6x + 8 = 0; .
tìm x biết
d) 9x^ 2 + 6x - 8 = 0.
e) x(x - 2) + x - 2 = 0;
f) 5x(x - 3) - x + 3 = 0
Tìm x biết:
a) (x - 3)2 - 5.(x - 2) + 5 = 0.
b) (2x - 1)2 - 3.(x - 2).(x + 2) - 25 = 0.
c) (x - 1)3 - x2.(x - 2) + 5 = 0.
d) x2 - 4x + 5 = 0.
3. Tìm x, biết
a) x - 1/9x = 0 b) 2x - 2y - x^2 + 2xy - y^2 = 0
c) x(x - 30) + x - 3 = 0 d) x^2 (x - 3) + 27 - 9x = 0
4. Phân tích các đa thức sau thành nhân tử:
a) x^2 - 4x + 3 b) x^2 + x - 6
c) x^2 - 5x + 6 d) x^4 + 4
tìm x biết
a/x^3+3x^2+3x+2=0
b/x^4-2x^3+2x-1=0
c/x^4-3x^3-6x^2+8x=0
Tìm x, biết :
a) 2x (x-3) -3 (x-3) = 0
b) 3x (x-4) . x+4 = 0
c) 4x2 - 1 = 0