" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
(3a - b + c) (3a - b + c) = 9a^2 - 3ab + 3ac - 3ab + b^2 - bc + 3ac - bc + c^2 = 9a^2 + b^2 + c^2 - 6ab - 2bc + 6ac