Moomoomcswaggi Moomoomcswaggi

05-11-2019
Mathematics

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Your friend multiplied complex numbers and expressions as shown. Find the error in your friends work. Then factor the expression correctly. Show work please.

(4-7i)(4+7i)=16+28i-28i+49i^2
=16-49
=-33

Respuesta :

sqdancefan sqdancefan

05-11-2019

Answer:

= 16+49 = 65

Step-by-step explanation:

The error is at the end of the first line. (-7i)(7i) = -49i² ≠ +49i².

The correct work is ...

(4-7i)(4+7i)=16+28i-28i-49i^2

= 16+49

= 65

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