Antwoord:
# X = 4 #
# X = -10 #
Uitleg:
# X ^ 2 + 6x = 40 #
of
# X ^ 2 + 2 (x) (3) + 9 = 40 + 9 #
of
# X ^ 2 + 2 (x) (3) + 3 ^ 2 = 49 #
of
# (X + 3) = 2 ^ 7 ^ 2 #
of
# X + 3 = + - 7 #
of
# X = -3 + -7 #
# X = -3 + 7 #
# X = 4 #======== Ans #1#
of
# X = -3-7 #
# X = -10 #======= Ans #2#