# algebra maginary numbers

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(3+4i)(3-4i)

• algebra maginary numbers -

just expand it as if the i was a variable

(3+4i)(3-4i)
= 9 - 12i + 12i -12i^2, now remember i^2 = -1
= 9 - 12(-1)
= 9+12
= 21

• algebra maginary numbers -

wait when you factor it wouldnt it be 9-12i+12i-16i^2

• algebra maginary numbers -

of course, my silly error

• algebra maginary numbers -

its totally cool you have helped alot :)

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