\(x^3+6x^2+12x+8=0\)
\(\Rightarrow x^3+8+6x^2+12x=0\)
\(\Rightarrow x^3+2^3+3.2.x^2+3.2^2.x=0\)
\(\Rightarrow\left(x+2\right)^3=0\)
\(\Rightarrow x+2=0\Rightarrow x=-2\)
\(x^3+6x^2+12x+8=0\)
\(\Rightarrow x^3+8+6x^2+12x=0\)
\(\Rightarrow x^3+2^3+3.2.x^2+3.2^2.x=0\)
\(\Rightarrow\left(x+2\right)^3=0\)
\(\Rightarrow x+2=0\Rightarrow x=-2\)
tìm x biết
x^3-6x^2+12x-8=0
tìm x: x^3-6x^2+12x-8=0
b)16x^2-9(x+1)^2+0
c)-27+27x-9x^2+x^3=0
d)x^2-6x+5=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:
a.(x-3).(x+3)=(x-5)^2
b.(2x+1)^2-4x.(x-1)=17
c.(3x-2).(3x+2)-9.(x-1).x=0
d.(3-x)^3-(x+3)^3=36x^2-54x
e.x^3-6x^2+12x-8=27
Giúp mình nhé.
Tìm x biết:
a) x3 - 6x2 + 12x - 8 = 0
b)x3 + 9x2 +27x + 27 = 0
c) 8x3 - 12x2 + 6x = 1
d) x3 - 3x2 + 3x = 28
tìm x biết
x^3-6x^2+12x-8=-8
tìm x biết
x^3-6x^2+12x-8=-8
tìm x,biết:
a) x^3-6x^2+12x-9=0
b) 8x^3+12x^2+6x-26=0
~bạn nào biết thì giúp mk nha,cảm ơn nhiều~
Tìm x biết
a)(x+3)^2(x-2)^2=2x b)7x(x-2)=(x-2) c)8x^3-12x^2+6x-1=0
d)4x^2-9-x(2x-3)=0 e)x^3+5x^2+9x=-45 f)x^3-6x^2-x+30=0