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c) 130
Step-by-step explanation:
Given, Z= 7-9i
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Conjugate of Z= (Z) = 7+9i
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Z.Z= (7-9i).(7+9i) [ a²-b² = (a+b)(a-b)]
[i² = -1]
= (7)²- (9i)²
= {49-(-81)}
= (49+81) = 130
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