document.write( "Question 540696: what is the equivalent to (6+3i)(6-3i) and how would u work it out?????? \n" ); document.write( "
Algebra.Com's Answer #353809 by mananth(16946)\"\" \"About 
You can put this solution on YOUR website!
(6+3i)(6-3i)\r
\n" ); document.write( "\n" ); document.write( "(a+b)(a-b)=a^2-b^2\r
\n" ); document.write( "\n" ); document.write( "(6+3i)(6-3i)=36-9i^2\r
\n" ); document.write( "\n" ); document.write( "36 -9*(sqrt(-1)^2)\r
\n" ); document.write( "\n" ); document.write( "36-(9*-1)\r
\n" ); document.write( "\n" ); document.write( "36+9
\n" ); document.write( "=45
\n" ); document.write( "
\n" );