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algol [13]
3 years ago
10

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
Mathematics
1 answer:
MaRussiya [10]3 years ago
6 0

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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Answer:

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4 0
2 years ago
Find the least number by which 243 must be divided to make it a perfect<br> square.
yaroslaw [1]

Answer:

Step-by-step explanation:

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4 0
3 years ago
Which graph represents the solution set for the system 2x + y ≤ 3 and y − x &gt; 2?
natka813 [3]
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Now work on each of the equations.
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3 years ago
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3 years ago
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