x²=7⇒ x=√7
2x²=98 ⇒ x²=98/2=49 ⇒ x=√49=7
x²+2=0⇒x²=0-2=-2 (nr. negativ) ⇒x∈∅
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x²=7⇒ x=√7
2x²=98 ⇒ x²=98/2=49 ⇒ x=√49=7
x²+2=0⇒x²=0-2=-2 (nr. negativ) ⇒x∈∅