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Plz help me with this
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4 votes
Plz help me with this

Plz help me with this-example-1
User Raelshark
by
4.6k points

2 Answers

5 votes

(-4 + 7i)(-4 - 7i)

= 16 - 49i2

Since i = √-1,

16 - 49i2

= 16 + 49

= 65

User Krunal V
by
5.1k points
1 vote

Answer: 65

Explanation:

(-4 + 7i)(-4 - 7i)

= -4(-4 - 7i) +7i(-4 - 7i)

= 16 + 28i -28i - 49i²

= 16 - 49(-1) Note: i² = -1

= 16 + 49

= 65

User Corcus
by
4.4k points
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