a.
[tex]x + 6 = 9 \\ x + 6 = - 9 \\ x = 3 \\ x = - 15 \\ \\ \\ [/tex]
b.
[tex]3x - 1 = 2x + 9 \\ 3x - 1 = - (2x + 9) \\ x = 10 \\ x = - \frac{8}{5} [/tex]
c.
[tex]x ^{2} + 2 \sqrt{2} x + 2 = x {}^{2} - 2 + 4 + 4 \sqrt{2} \\ 2 \sqrt{2} x + 2 = 2 + 4 \sqrt{2} \\ 2 \sqrt{2} x = 4 \sqrt{2} \\ x = 2[/tex]
d.
[tex] \sqrt{10} x + 4 \sqrt{10} + 3 \sqrt{10} x - 6 \sqrt{10} = 4x - 2 \\ 4 \sqrt{10} x - 2 \sqrt{10} = 4x - 2 \\ 4 \sqrt{10} x - 4x = - 2 + 2 \sqrt{10} \\ x = \frac{ - 2 + 2 \sqrt{10} }{4 \sqrt{10} - 4 } \\ x = \frac{1}{2} [/tex]
Sper ca te-am ajutat!
