Question

Ayudaaaaa xfa :c no entiendo ​

Answer 1

Explicación paso a paso:

$x = x{2} - 12 + 4x{2} \\ x - x {2} - 4x = - 12 \\ - 5x{2} = - 12 \\ x {2} = - 12 + 5 \\ x{2} = - 7 \\ x = \sqrt{7} \\ x = 2.6457$