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OpenStudy (usernamenottaken):
Simplify (5- 3i)^2. Will medal.
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OpenStudy (sweetburger):
Expand it first using foil method. writing it like this (5-3i)(5-3i)
jhonyy9 (jhonyy9):
exactly @sweetburger nice job
OpenStudy (usernamenottaken):
so 16 - 30 i
OpenStudy (usernamenottaken):
anyone?
jhonyy9 (jhonyy9):
(5-3i)(5-3i) = 5*5 -5*3i -3i*5 -3i*(-3i) = ?
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jhonyy9 (jhonyy9):
step by step not directly answers - for anybody can understanding it right sure easy
OpenStudy (usernamenottaken):
thats what i got, i even double checked with wolframalpha http://www.wolframalpha.com/input/?i=(5-3i)(5-3i)
jhonyy9 (jhonyy9):
(5-3i)(5-3i) = 5*5 -5*3i -3i*5 -3i*(-3i) = ? =25 -15i -15i +9(i^2) = =25 -30i + ?
jhonyy9 (jhonyy9):
do you can continue it please ?
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