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Rezolvati ecuatiile : a) x² = 7 b) 2x² = 98 c) x²+2 = 0

Răspuns :

x²=7
x=√7


2x²=98
x²=98:2
x²=49
x=√49
x=7

x²+2=0
x²=-2  imposibil
[tex]a)x^2=7\\ x= \sqrt{7} \\ \\b)2x^2=98\\ x^2=98:2\\ x^2=49\\ x= \sqrt{49} \\ x=7\\\\ c)x^2+2=0\\ x^2=-2\\ x= \sqrt{-2} [/tex]