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4x^2+y^2-4x+10y+26=0
<=>4x2-4x+1+y2+10x+25=0
<=>(2x-1)2+(y+5)2=0
<=>2x-1=0 và y+5=0
<=>x=1/2 và y=-5
a: \(x^2+3y^2-4x+6y+7=0\)
\(\Leftrightarrow x^2-4x+4+3y^2+6y+3=0\)
\(\Leftrightarrow\left(x-2\right)^2+3\left(y+1\right)^2=0\)
\(\Leftrightarrow\left(x,y\right)=\left(-2;1\right)\)
câu này căng đấy nhưng tớ sẽ cố giúp
thế này:
4x2 +y2-4x+10y+26=0.
= 4x\(^2\)- 4x+1+y\(^2\)+10x+25=0
= (2x-1)\(^2\)+ (y+5)\(^2\)= 0
=2x-1=0 và y+5=0
= x= 1/2 và y=-5
\(4x^2+y^2-4x+10y+26=0\)
\(\Leftrightarrow\)\(\left(4x^2-4x+1\right)+\left(y^2+10y+25\right)=0\)
\(\Leftrightarrow\)\(\left(2x-1\right)^2+\left(y+5\right)^2=0\)
\(\Leftrightarrow\)\(\hept{\begin{cases}2x-1=0\\y+5=0\end{cases}}\)
\(\Leftrightarrow\)\(\hept{\begin{cases}x=\frac{1}{2}\\y=-5\end{cases}}\)
Vậy..
4x2 - 4x + y2 + 10y + 26 = 0
<=> [(2x)2 - 2.2x + 1] + (y2 + 2.5y + 52) = 0
<=> (2x - 1)2 + (y + 5)2 = 0
Mà \(\left(2x-1\right)^2\ge0\forall x;\left(y+5\right)^2\ge0\forall y\)
nên \(\left\{{}\begin{matrix}\left(2x-1\right)^2=0\\\left(y+5\right)^2=0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=-5\end{matrix}\right.\)
\(4x^2-4x+y^2+10y+26=0\)
=> \(4x^2-4x+y^2+10y+25+1=0\)
=> \(\left(4x^2-4x+1\right)+\left(y^2+10y+25\right)=0\)
=> \(\left(2x-1\right)^2+\left(y+5\right)^2=0\)
Ta thấy:
\(\left(2x-1\right)^2\ge0\)
\(\left(y+5\right)^2\ge0\)
=>\(\left(2x-1\right)^2+\left(y+5\right)^2\ge0\)
Mà \(\left(2x-1\right)^2+\left(y+5\right)^2=0\)
=>\(\left\{{}\begin{matrix}2x-1=0\\y+5=0\end{matrix}\right.\)
=>\(\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=-5\end{matrix}\right.\)
Vậy x = \(\dfrac{1}{2}\); y = -5
a, \(x^2+y^2-2x+10y+26=0\)
\(\Leftrightarrow\left(x^2-2x+1\right)+\left(y^2+10y+25\right)=0\)
\(\Leftrightarrow\left(x-1\right)^2+\left(y+5\right)^2=0\)
\(\Leftrightarrow\hept{\begin{cases}x-1=0\\y+5=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=1\\y=-5\end{cases}}\)
b,\(4x^2+2y^2+2xy-2y+1=0\)
\(\Leftrightarrow\left(4x^2+4xy+y^2\right)+\left(y^2-2y+1\right)=0\)
\(\Leftrightarrow\left(2x+y\right)^2+\left(y-1\right)^2=0\)
\(\Leftrightarrow\hept{\begin{cases}2x+y=0\\y-1=0\end{cases}}\Leftrightarrow\hept{\begin{cases}2x+1=0\\y=1\end{cases}}\Leftrightarrow\hept{\begin{cases}x=-\frac{1}{2}\\y=1\end{cases}}\)
c,\(5x^2+9y^2-12xy+4x+4=0\)
\(\Rightarrow\left(x^2+4x+4\right)+\left(4x^2-12xy+9y^2\right)=0\)
\(\Rightarrow\left(x+2\right)^2+\left(2x-3y\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}x+2=0\\2x-3y=0\end{cases}}\Rightarrow\hept{\begin{cases}x=-2\\2.\left(-2\right)-3y=0\end{cases}}\Rightarrow\hept{\begin{cases}x=-2\\y=-\frac{4}{3}\end{cases}}\)
d,\(5x^2+9y^2-6xy-4x+1=0\)
\(\Rightarrow\left(4x^2-4x+1\right)+\left(x^2-6xy+9y^x\right)=0\)
\(\Rightarrow\left(2x+1\right)^2+\left(x-3y\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}2x+1=0\\x-3y=0\end{cases}\Rightarrow}\hept{\begin{cases}x=-\frac{1}{2}\\-\frac{1}{2}-3y=0\end{cases}\Rightarrow}\hept{\begin{cases}x=-\frac{1}{2}\\y=-\frac{1}{6}\end{cases}}\)
4x^2 +y^2 -4x+10y+26=0
4x^2-4x+1 +y^2+10y+25 =0
(2x-1)^2+(y+5)^2=0
suy ra 2x-1=0 và y+5=0
x=1/2,y=-5
4x2 + y2 - 4x + 10y + 26 = 0
<=> ( 4x2 - 4x + 1 ) + ( y2 + 10y + 25 ) = 0
<=> ( 2x - 1 )2 + ( y + 5 )2 = 0
<=> \(\hept{\begin{cases}2x-1=0\\y+5=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=-5\end{cases}}\)