Mister Exam

196 canonical form

The teacher will be very surprised to see your correct solution 😉

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Invariants method
Given line equation of 2-order:
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This equation looks like:
a11x2+2a12xy+2a13x+a22y2+2a23y+a33=0a_{11} x^{2} + 2 a_{12} x y + 2 a_{13} x + a_{22} y^{2} + 2 a_{23} y + a_{33} = 0
where
a11=0a_{11} = 0
a12=0a_{12} = 0
a13=0a_{13} = 0
a22=0a_{22} = 0
a23=0a_{23} = 0
a33=196a_{33} = 196
The invariants of the equation when converting coordinates are determinants:
I1=a11+a22I_{1} = a_{11} + a_{22}
     |a11  a12|
I2 = |        |
     |a12  a22|

I3=a11a12a13a12a22a23a13a23a33I_{3} = \left|\begin{matrix}a_{11} & a_{12} & a_{13}\\a_{12} & a_{22} & a_{23}\\a_{13} & a_{23} & a_{33}\end{matrix}\right|
I(λ)=a11λa12a12a22λI{\left(\lambda \right)} = \left|\begin{matrix}a_{11} - \lambda & a_{12}\\a_{12} & a_{22} - \lambda\end{matrix}\right|
     |a11  a13|   |a22  a23|
K2 = |        | + |        |
     |a13  a33|   |a23  a33|

substitute coefficients
I1=0I_{1} = 0
     |0  0|
I2 = |    |
     |0  0|

I3=00000000196I_{3} = \left|\begin{matrix}0 & 0 & 0\\0 & 0 & 0\\0 & 0 & 196\end{matrix}\right|
I(λ)=λ00λI{\left(\lambda \right)} = \left|\begin{matrix}- \lambda & 0\\0 & - \lambda\end{matrix}\right|
     |0   0 |   |0   0 |
K2 = |      | + |      |
     |0  196|   |0  196|

I1=0I_{1} = 0
I2=0I_{2} = 0
I3=0I_{3} = 0
I(λ)=λ2I{\left(\lambda \right)} = \lambda^{2}
K2=0K_{2} = 0
Because
I2=0I3=0(I1=0K2=0)I_{2} = 0 \wedge I_{3} = 0 \wedge \left(I_{1} = 0 \vee K_{2} = 0\right)
then by line type:
this equation is of type : two coincident straight lines
I1y~2+K2I1=0I_{1} \tilde y^{2} + \frac{K_{2}}{I_{1}} = 0
or
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- reduced to canonical form