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3 years ago

Help, please! Struggling!

Mathematics

1 answer:

MArishka [77]3 years ago

6 0

Answer:

Step-by-step explanation:

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

16 + 49 = 65

the fault here is i^2= -1 and -1 multiplied by -49 is +49 not -49

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