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2 years ago

What is the product of (2+7i)(2-7i) in the from a+bi

Mathematics

2 answers:

eimsori [14]2 years ago

6 0

I = sqrt(-1), i^2 = -1

So multiplying it out;

4 - 14i + 14i - 49i^2

4 - 49 * -1

= 53

Luden [163]2 years ago

6 0

Answer:

Step-by-step explanation:

(2+7i)(2-7i) = 2² - (7i)² { ( a+b) (a-b) = a²-b² }

= 4 - 7² * i²

= 4 - 49* (-1)

= 4 + 49

= 53

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Answer:

Here's what I get.

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Your table then becomes

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2 years ago

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3 years ago

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Step-by-step explanation:

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