" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
b) (3x+8).(3x-8)
c) (9m+5n).(9m-5n)
d) ((4a)² + 2.4a.(-5b) + (-5b)²) - 4.(a² + 2.a.2b + (2b)²)
= (16a² - 40ab + 25b²) - 4.(a² + 4ab + 4b²)
= 16a² - 40ab + 25b² - 4a² - 16ab -16b²
= 16a² - 4a² + 25b² - 16b² - 40ab - 16ab
= 12a² + 9b² - 56ab