Question

Vektor

|a|=|b| = 5.

hitunglah (a+b).(a-b)

Answer 1

|a|=|b| = 5
Maka
a = 5
b = 5
Nilai:
(a+b).(a-b)
= (5+5).(5-5)
= (10).(0)
= 0