Posted by sarah on .
(10 Squar root 13)(5 square root 5)
put in standard form a+bi
I really don't understand square roots so can you show me how to do these please

Math 
Reiny,
by definition √1 = i
so rewrite
(10√13)(5√5) as
(10√1√13)(5√i√5)
= (10i√13)(5i√5)
= 50i^2√65
= +50√5