Question

qual a resposta
$5 { \times }^{2} + 4 = 49$
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Answer 1

$5x {}^{2} = 49 - 4 \\ 5x {}^{2} = 45 \\ x {}^{2} = 9 \\ x = ±3 \\ x = - 3 \\ x = 3 \\ x {}^{1} = - 3 \\ x {}^{2} = 3$

Espero ter ajudado!