Question

13/x = x/21 Es proporcional, alguien sabe?

Answer 1

$\frac{13}{x} = \frac{x}{21}\\ \\21(13) = x.x\\\\273 = x^{2} \\\\\sqrt{273} = \sqrt{x^{2} }\\ \\\sqrt{273} = x$

Eternamente axllxa