" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
= (3y . 4x) + (3y . (-y)) - (5x . 4x) + ((-5x) . (-y)
= 12xy - 3y² - 20x² + 5xy
= -20x² - 3y² + 17xy