Question

Rezolvati in multimea numerelor reale ecuatia : 7x la puterea 2 = 84
$7{x}^{2} = 84$
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Answer 1

7x² = 84

x² = 84 : 7

x² = 12

x = √12

x = √2²·3

x = ± 2√3

Answer 2

7x²=84 /:7

x²=12

x=±√12

x=±2√3

=>S={-2√3, 2√3}