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\(x^2-4x+9y^2+6y+10\\ =\left(x^2-4x+4\right)+\left(9y^2+6y+1\right)+5\\ =\left(x-2\right)^2+\left(3y+1\right)^2+5\ge5>0\)
1.
\(x^2\)+\(y^2\)+2y-6x+10=0
=> \(x^2\)-6x+9 +\(y^2\)+2y+1=0
=> (x-3)\(^2\)+(y+1)\(^2\)=0
pt vô nghiệm
4.
=> \(x^2\)+8x+16+(3y)\(^2\)-2.3.2y+4=0
=> (x+4)\(^2\)+(3y-2)\(^2\)=0
pt vô nghiệm
a) \(3\left(x-y\right)^2+9y\left(y-x\right)^2\)
\(=3\left(x-y\right)^2+9y\left(x-y\right)^2\)
\(=\left(x-y\right)^2\left(3-9y\right)\)
\(=3\left(x-y\right)^2\left(3y+1\right)\)
b) \(3\left(x-y\right)^2+9y\left(y-x\right)\)
\(=3\left(y-x\right)^2+9y\left(y-x\right)\)
\(=\left(y-x\right)\left[3\left(y-x\right)+9y\right]\)
\(=3\left(y-x\right)\left(y-x+3y\right)\)
\(=3\left(y-x\right)\left(4y-x\right)\)
a: =3(x-y)^2+9y(x-y)^2
=(x-y)^2(3+9y)
=(x-y)^2*3*(y+3)
b: =3(x-y)^2-9y(x-y)
=3(x-y)(x-y-9y)
=3(x-y)(x-10y)
a) \(\left(x-4\right)\left(x+4\right)-x\left(x+2\right)=10\)
<=> \(x^2-16-x^2-2x=10\)
<=> \(-16-2x-10=0\)
<=> \(x=-13\)
Vậy pt có tập nghiệm S\(\)={-13}
b) \(\frac{\left(x+3\right)}{2}-\frac{\left(x-2\right)}{3}=2-\frac{\left(x+3\right)}{2}\)
<=> \(3\left(x+3\right)-2\left(x-2\right)=2.6-3\left(x+3\right)\)
<=> \(3x+9-2x+4=12-3x-9\)
<=> \(3x+9-2x+4-12+3x+9=0\)
<=> \(4x+10=0\)
<=> \(x=\frac{-5}{2}\)
Vậy pt có tập nghiệm S={\(\frac{-5}{2}\)}
a) \(\left(x-4\right)\left(x+4\right)-x\left(x+2\right)=10\)
\(\Leftrightarrow x^2-16-x^2-2x-10=0\)
\(\Leftrightarrow-26=2x\Leftrightarrow x=\frac{-26}{2}=-13\)
b) \(\frac{\left(x+3\right)}{2}-\frac{\left(x-2\right)}{3}=2-\frac{\left(x+3\right)}{2}\)
\(\Leftrightarrow\left(\frac{3\left(x+3\right)-2\left(x-2\right)}{6}\right)=\frac{12-3\left(x+3\right)}{6}\)
\(\Leftrightarrow3x+9-2x+4=12-3x-9\)
\(\Leftrightarrow x+13=-3x+3\)
\(\Leftrightarrow x+3x=-13+3\)
\(\Leftrightarrow4x=-10\Leftrightarrow x=\frac{-10}{4}=-2,5\)
\(=x^2-y^2+9x-9y\)
\(=\left(x-y\right)\left(x+y\right)+9\left(x-y\right)\)
\(=\left(x-y\right)\left(x+y+9\right)\)