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What is (i)(-7i) ? Simplify

Sagot :

[tex] i^{2} [/tex]=-1 so 7
AL2006idn
If  ' i '  is just any old number, then  (i) x (-7i)  =  -7 i² .

But if  ' i '  am  √(-1) , then    (-7) x (i²)  =  (-7) x (-1)  and that's  +7 .
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