" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Bab AljabarMatematika SMP Kelas VIII
16 (a + b)² - 25 (a - b)² = (4 (a + b))² - (5 (a - b))²
= (4 (a + b) + 5 (a - b)) (4(a + b) - 5(a - b))
= (4a + 4b + 5a - 5b) (4a + 4b - 5a + 5b)
= (9a - b) (-a + 9b)
= -9a² + 81ab + ab - 9b²
= -9a² + 82b - 9b²