Question

x² - 3 - 18 = 0 ayuddaaaa​

Answer 1

Respuesta y proceso:

x^2 - 3 - 18 = 0

$x^2 - 3 - 18 = 0\\\\x^2=18+3\\\\x^2=21\\\\x=\sqrt{21}$

Comprobación

$\sqrt{21}^2 -3-18=0\\\\\frac{2}{2} \cdot 21 -3 -18=0\\\\1\cdot 21 -3-18=0\\\\21-3-18=0\\\\21-21=0\\\\0=0$