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Tenemos:
Las diagonales:
BD = AC
7x² - 8 = 10x
7x² - 10x - 8 = 0
7x + 4
x - 2
7x + 4 = 0
7x = - 4
x = - 4 / 7, no
x - 2 = 0
x = 2, si
AC = 10x
AC = 10(2)
AC = 20
Las diagonales:
AC = 20
BD = 20