document.write( "Question 453281: Please help me. perform the indicated operation. write the result in the form
\n" ); document.write( "a + bi. (5i)(-4i)
\n" ); document.write( "

Algebra.Com's Answer #804701 by CubeyThePenguin(3113)\"\" \"About 
You can put this solution on YOUR website!
Remember that i^2 = -1.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "(5i)(-4i)
\n" ); document.write( "= -20i^2
\n" ); document.write( "= 20
\n" ); document.write( "
\n" );