Question

x²-25=0$<var>x²-25=0</var>$

Answer 1

$x^{2} -25=0 \\ \\ x^{2} =25 \\ \\ x=\sqrt{25} \\ \\ \boxed{x=+-5}$

Answer 2

Resposta:

$S=\{-5,5\}$

Explicação passo-a-passo:

$x^{2} -25=0\\x^{2} =0+25\\x^{2} =25\\x=\pm\sqrt{25} \\x=\pm\:5\\\\S=\{-5,5\}$