Question

2√4+ (x²-81) - 4 = 0

Answer 1

Resposta:

$2 \sqrt{4} + ({x}^{2} - 81) - 4 = 0$

$2 \times 2 + ( {x}^{2} - 81) - 4 = 0$

$4 - 4( {x }^{2} - 81) = 0$

${x}^{2} - 81 = 0$

${9}^{2} - 81 = 0$

$81 - 81 = 0$