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 #353810 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
You have to use the rule $\"+i%5E2+=+-1+\"$
\n" ); document.write( " $\"+%28+6+%2B+3i+%29%2A%28+6+-+3i+%29++=+36+%2B+3%2A6%2Ai+-+3%2A6%2Ai++-+3%2A3%2Ai%5E2+\"$
\n" ); document.write( " $\"+%28+6+%2B+3i+%29%2A%28+6+-+3i+%29++=+36+%2B+18i+-+18i+-+9%2A%28-1%29+\"$
\n" ); document.write( " $\"+%28+6+%2B+3i+%29%2A%28+6+-+3i+%29++=+36+%2B+9+\"$
\n" ); document.write( " $\"+%28+6+%2B+3i+%29%2A%28+6+-+3i+%29++=+45+\"$ \n" ); document.write( "

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