Question

ME AYUDAN, es de matematicas

Answer 1

Explicación paso a paso:

$a = \frac{b \times h}{2} \\ 18 = \frac{5 + x \times x}{2} \\ 18 \times 2 = 5 + {x}^{2} \\ 36 = 5 + {x}^{2} \\ 36 - 5 = {x}^{2} \\ 31 = {x}^{2} \\ \sqrt{31} = x$