b)
[tex]a_{33}=y^2+6[/tex]
[tex]b_{33}=2y[/tex]
[tex]a_{21}=3\\\\b_{12}=-6[/tex]
[tex]y^2+6+2y=9\\\\y^2+2y-3=0\\\\\Delta=4+12=16\\\\y_1=1\\\\y_2=-3[/tex]
c)
-2x-2x²=6-10
-2x²-2x=-4
2x²+2x-4=0 |:2
x²+x-2=0
Δ=1+8=9
x=1 si x=-2
Un alt exercitiu cu matrice gasesti aici: https://brainly.ro/tema/9685683
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