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OpenStudy (anonymous):
perform the indicated operation (9+7i)(9-7i) answer in the form a+bi
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OpenStudy (anonymous):
\[(a+bi)(a-bi)=a^2+b^2\]
OpenStudy (anonymous):
81-63i+63i-49i^2
OpenStudy (anonymous):
\[9^2+7^2=81+49\]
OpenStudy (anonymous):
(9+7i)(9-7i) 81-63i+63i-49i^2 81-49i^2
OpenStudy (anonymous):
(9+7i)(9-7i) =81-63i+63i =81-49i^2 =130+0i ans....
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