# Write Complex Numbers in Standard Form...2

Discussion in 'Other Pre-University Math' started by nycmathguy, Sep 15, 2021.

1. ### nycmathguy

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Section 2.4
Question 60

sqrt{-5} • sqrt{-10}

Let sqrt{-5} = sqrt{5}•sqrt{-1} = 5i

Let sqrt{-10} = sqrt{10} • sqrt{-1} = 10i

Note: sqrt{-1} = i.

(5i)(10i)

50i^2

Note: i^2 = -1.

50(-1) = -50

Answer: -50

You say?

Can you do 66?

Thanks.

nycmathguy, Sep 15, 2021
2. ### MathLover1

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60.

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66

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MathLover1, Sep 15, 2021
nycmathguy likes this.
3. ### nycmathguy

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I did my best but most likely rushed my way through question 60. Nicely done at your end.

nycmathguy, Sep 16, 2021
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