Question

me ayudan resolver con comprovecion​

Answer 1

Explicación paso a paso:

$\frac{ {x}^{2} + 12 }{3} = 18 \\ {x }^{2} + 12 = 3(18) \\ {x}^{2} = 54 - 12 \\ {x}^{2} = 42 \\ x = \sqrt{42}$