(X2-9)2-9(x-3)2=0
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a: (x^2+9)(9x^2-1)=0
=>9x^2-1=0
=>x^2=1/9
=>x=1/3 hoặc x=-1/3
b: (4x^2-9)(2^(x-1)-1)=0
=>4x^2-9=0 hoặc 2^(x-1)-1=0
=>x^2=9/4 hoặc x-1=0
=>x=1;x=3/2;x=-3/2
c: (3x+2)(9-x^2)=0
=>(3x+2)(3-x)(3+x)=0
=>\(\left[{}\begin{matrix}3x+2=0\\3-x=0\\3+x=0\end{matrix}\right.\Leftrightarrow x\in\left\{-\dfrac{2}{3};3;-3\right\}\)
d: (3x+3)^2(4x-4^2)=0
=>3x+3=0 hoặc 4x-16=0
=>x=4 hoặc x=-1
e: \(2^{\left(x-5\right)\left(x+2\right)}=1\)
=>(x-5)(x+2)=0
=>x-5=0 hoặc x+2=0
=>x=5 hoặc x=-2
\(\left(x^2-9\right)^2-9\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2\left(x+3\right)^2-9\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2\left[\left(x+3\right)^2-9\right]=0\)
\(\Leftrightarrow\left(x-3\right)^2\left[x^2+6x+9-9\right]=0\)
\(\Leftrightarrow\left(x-3\right)^2\left(x^2+6x\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x\left(x+6\right)=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\\left[{}\begin{matrix}x=0\\x=-6\end{matrix}\right.\end{matrix}\right.\)
Vậy \(S=\left\{0;3;-6\right\}\)
\(\left(x-3\right)^2\left(x+3\right)^2-9\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2\left(x+3-3\right)\left(x+3+3\right)=0\Leftrightarrow x=3;x=0;x=-6\)
a/
\(\Leftrightarrow x^2-2x+4-4=0\\ \Leftrightarrow x\left(x-2\right)=0\)
\(\Leftrightarrow x=0;x-2=0\)
\(\Leftrightarrow x=0;x=2\)
b/
\(\Leftrightarrow\left(x-3\right)\left(x+3\right)-2x\left(x-3\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(x+3-2x\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(3-x\right)=0\)
\(\Rightarrow x=3\)
\(a,5x\left(x^2-9\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x^2=9\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\\ b,3\left(x+3\right)-x^2-3x=0\\ \Leftrightarrow3\left(x+3\right)-x\left(x+3\right)=0\\ \Leftrightarrow\left(x+3\right)\left(3-x\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\\ c,x^2-9x-10=0\\ \Leftrightarrow x^2+x-10x-10=0\\ \Leftrightarrow x\left(x+1\right)-10\left(x+1\right)=0\\ \Leftrightarrow\left(x-10\right)\left(x+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-1\\x=10\end{matrix}\right.\)
a, 5\(x\)(\(x^2\) - 9) = 0
\(\left[{}\begin{matrix}x=0\\x^2-9=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\)
Vậy \(x\) \(\in\) { -3; 0; 3}
b, 3.(\(x+3\)) - \(x^2\) - 3\(x\) = 0
3.(\(x+3\)) - \(x\).( \(x\) + 3) = 0
(\(x+3\))( 3 - \(x\)) = 0
\(\left[{}\begin{matrix}x=-3\\x=3\end{matrix}\right.\)
Vậy \(x\) \(\in\){ -3; 3}
c, \(x^2\) - 9\(x\) - 10 = 0
\(x^2\) + \(x\) - 10\(x\) - 10 = 0
\(x.\left(x+1\right)\) - 10.( \(x-1\)) = 0
(\(x+1\))(\(x-10\)) = 0
\(\left[{}\begin{matrix}x+1=0\\x-10=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-1\\x=10\end{matrix}\right.\)
Vậy \(x\) \(\in\){ -1; 10}
a: \(\Leftrightarrow\left(x-5\right)\left(x+1\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-1\\x=1\end{matrix}\right.\)
d: \(\Leftrightarrow\left(x+3\right)\left(x^2-4x+5\right)=0\)
\(\Leftrightarrow x+3=0\)
hay x=-3
\(\left(x^2-9\right)^2-\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2\cdot\left(x+2\right)\left(x+4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-2\\x=-4\end{matrix}\right.\)
Cảm ơn nhưng m lại ko hiểu làm sao ra đc như thế vậy. Bạn giải rõ ra đc ko
\(a,\Leftrightarrow x^2-x-x^2+4x-4=2\\ \Leftrightarrow3x=6\Leftrightarrow x=2\\ b,\Leftrightarrow\left(x-3\right)\left(x+3\right)-\left(x-3\right)\left(6-x\right)=0\\ \Leftrightarrow\left(x-3\right)\left(x+3-6+x\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{3}{2}\end{matrix}\right.\\ c,\Leftrightarrow x^2+2x-3x-6=0\\ \Leftrightarrow\left(x+2\right)\left(x-3\right)=0\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=3\end{matrix}\right.\)
Ta có: \(\left(x^2-9\right)^2-9\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2.\left(x+3\right)^2-9\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2.\left[\left(x+3\right)^2-9\right]=0\)
\(\Leftrightarrow\left(x-3\right)^2.\left(x^2+6x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-3=0\\x^2+6x=0\end{cases}}\)
\(\Leftrightarrow\)\(x=3\)hoặc \(\orbr{\begin{cases}x=0\\x=-6\end{cases}}\)
Vậy \(x\in\left\{-6;0;3\right\}\)
Cách khác nhé, cách bạn kia làm bên dưới vẫn nhanh hơn :v nên xem qua nhé !
\(\left(x^2-9\right)^2-9\left(x-3\right)^2=0\)
\(\Leftrightarrow\left(x^2-9\right)^2-\left[3\left(x-3\right)\right]^2=0\)
\(\Leftrightarrow\left(x^2-9\right)^2-\left(3x-9\right)^2=0\)
\(\Leftrightarrow\left(x^2-9-3x+9\right)\left(x^2-9+3x-9\right)=0\)
\(\Leftrightarrow\left(x^2-3x\right)\left(x^2+3x-18\right)=0\)
\(\Leftrightarrow x\left(x-3\right)^2\left(x-6\right)=0\Leftrightarrow x=0;x=3;x=6\)