tìm x
2 . ( x - 3 ) = 16 - ( - 3 ) - ( - 13 ) - 2
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b) \(\left(x-1\right)\left(x^2+x+1\right)-x\left(x-3\right)\left(x+3\right)=8\)
\(\Rightarrow x^3-1-x\left(x^2-9\right)=8\)
\(\Rightarrow x^3-1-x^3+9x=8\)
\(\Rightarrow9x=9\Rightarrow x=1\)
c) \(\left(x^2+2\right)\left(x-4\right)-\left(x+2\right)\left(x^2+4x+4\right)=-16\)
\(\Rightarrow x^3-4x^2+2x-8-\left(x+2\right)\left(x+2\right)^2=-16\)
\(\Rightarrow x^3-4x^2+2x-8-\left(x+2\right)^3=-16\)
\(\Rightarrow x^3-4x^2+2x-8-\left(x^3+6x^2+12x+8\right)=-16\)
\(\Rightarrow x^3-4x^2+2x-8-x^3-6x^2-12x-8=-16\)
\(\Rightarrow-10x^2-10x-16=-16\)
\(\Rightarrow10x^2+10x=0\)
\(\Rightarrow10x\left(x+1\right)=0\Rightarrow\left[{}\begin{matrix}x=0\\x+1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)
a: Ta có: \(\left(x-3\right)^3-\left(x-3\right)\left(x^2+3x+9\right)+6\left(x+1\right)^2+3x^2=-33\)
\(\Leftrightarrow x^3-9x^2+27x-27-x^3+27+6x^2+12x+1+3x^2=-33\)
\(\Leftrightarrow39x=-34\)
hay \(x=-\dfrac{34}{39}\)
b: Ta có: \(\left(x-3\right)\left(x^2+3x+9\right)-x\left(x-2\right)\left(x+2\right)=1\)
\(\Leftrightarrow x^3-27-x^3+4x=1\)
\(\Leftrightarrow4x=28\)
hay x=7
c: Ta có: \(\left(x+2\right)\left(x^2-2x+4\right)-x\left(x-3\right)\left(x+3\right)=26\)
\(\Leftrightarrow x^3+8-x^3+9x=26\)
\(\Leftrightarrow x=2\)
a) x = 4
b) x = 3
c) x = 2
d) x = 1
e) x = 3
f) x = 2
g) x = 4
h) x = 3
a: \(\Leftrightarrow\left(x-3\right)\left(5x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{1}{5}\end{matrix}\right.\)
b: \(\Leftrightarrow x\left(x-1\right)\left(x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\\x=-1\end{matrix}\right.\)
√(x2-6x+11) + √(x2-6x+13) + √(x2-4x+5) = 3+√2 (1)
Có: \(\sqrt{x^2-6x+11}=\sqrt{\left(x-3\right)^2+2}\ge\sqrt{2}\)
(Dấu = xảy ra khi x = 3)
\(\sqrt{x^2-6x+13}=\sqrt{\left(x-3\right)^2+4}\ge\sqrt{4}=2\)
(Dấu = xảy ra khi x = 3)
\(\sqrt{x^2-4x+5}=\sqrt{\left(x-2\right)^2+1}\ge1\)
(Dấu = xảy ra khi x = 2)
Nhận xét PT (1):
\(VT\ge3+\sqrt{2}\)
\(VP=3+\sqrt{2}\)
Nên: √(x2-6x+11) + √(x2-6x+13) + √(x2-4x+5) = 3+√2 khi: x = 3 và x = 2
=> PT vô nghiệm
a) Rút gọn được VT = 9x + 7. Từ đó tìm được x = 1.
b) Rút gọn được VT = 2x + 8. Từ đó tìm được x = 7 2 .
a, `x^2-2x+1=4`
`<=>(x-1)^2=2^2=(-2)^2`
`<=> [(x-1=2),(x-1=-2);}`
`<=> [(x=3),(x=-1):}`
b, `16-(x-3)^2=0`
`<=>(x-3)^2=4^2=(-4)^2`
`<=> [(x-3=4),(x-3=-4):}`
`<=> [(x=7),(x=-1):}`
a) Ta có: \(x^2-2x+1=4\)
\(\Leftrightarrow\left(x-1\right)^2=4\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=2\\x-1=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\)
b) Ta có: \(16-\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2=16\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=4\\x-3=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-1\end{matrix}\right.\)
2(x-3)=16-(-3)-(-13)-2
2(x-3)=30
x-3=15
x=18
2 . ( x - 3 ) = 16 - ( - 3 ) - ( - 13 ) - 2
2.(x-3)=16+3+13-2=34
x-3=34:2=17
x=17+3=20