a)[tex] x^{2} [/tex] = 1
x = [tex] \sqrt{1} [/tex]
x = 1
b)2[tex] x^{2} [/tex]+1 = -7
2[tex] x^{2} [/tex] = -7-1
2[tex] x^{2} [/tex] = -8
[tex] x^{2} [/tex] = [tex] \frac{-8}{2} [/tex]
[tex] x^{2} [/tex] = -4 ·/(-1)
-x = [tex] \sqrt{4} [/tex]
-x = 2 ·/(-1)
x = -2
c)[tex] x^{2} [/tex]+2[tex] x^{2} [/tex]=4[tex] x^{2} [/tex]
3[tex] x^{2} [/tex] ≠ 4[tex] x^{2} [/tex]
Ecuatia nu are solutie.
