Válasz:
#x = 8 #
Magyarázat:
#sqrt (x + 8) = 12 / sqrt (x + 8) + 1 #
enged #sqrt (x + 8) = a #
#a = 12 / a + 1 #
# a ^ 2 - a - 12 = 0 #
# (a + 3) (a - 4) = 0 #
#a = -3, a = 4 #
#sqrt (x + 8) = a #
#sqrt (x + 8) = -3: # nincs megoldás a valós számok felett.
#sqrt (x + 8) = 4 #
#x + 8 = 16 #
#x = 8 #