Question

6x2 - 21 = 51
Cuánto es?

Answer 1

Respuesta:

$x = 2 \sqrt{3}$

Explicación paso a paso:

$6 {x}^{2} - 21 = 51 \\ \\ 6 {x}^{2} = 51 + 21 \\ \\ 6 {x}^{2} = 72 \\ \\ {x}^{2} = \frac{72}{2} \\ \\ {x}^{2} = 12 \\ \\ x = \sqrt{12} \\ \\ x = 2 \sqrt{3}$