Answer:
1. A =3i - 9j
B = -4i + 2j
A.B = -12 - 18 = -30
2. A = 5i + 5j
B = 2i - 4j
A.B = 10 - 20 = -10
3. A = 8i + 4j
B = 41 - 8j
A.B = 32 - 32 = 0
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