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OpenStudy (rosajovannaportillo):
simplify (2+i)-(-3+9i)
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OpenStudy (zzr0ck3r):
hint: -(3+9i) = -3-9i and i-9i = -8i
OpenStudy (rosajovannaportillo):
i don't know how to solve this. can you show me how?
OpenStudy (sshayer):
\[\left( a+\iota b \right)-\left( c+id \right)=\left( a-c \right)+\iota \left( b-d \right)\]
OpenStudy (rosajovannaportillo):
5-8i?
OpenStudy (rosajovannaportillo):
@zzr0ck3r
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OpenStudy (sshayer):
correct.
OpenStudy (rosajovannaportillo):
thank you!!
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