document.write( "Question 551480: x(to the 4th power)-6x(squared)-27=0. whats the answer? \n" ); document.write( "

Algebra.Com's Answer #359738 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+x%5E4+-+6x%5E2+-+27+=+0+\"$
\n" ); document.write( "Make the substitution $\"+z+=+x%5E2+\"$
\n" ); document.write( " $\"+z%5E2+-+6z+-+27+-+0+\"$
\n" ); document.write( " $\"+%28+z+-+9+%29%2A%28+z+%2B+3+%29+=+0+\"$ ( I solved by looking at it )
\n" ); document.write( " $\"+z+=+9+\"$
\n" ); document.write( " $\"+x%5E2+=+9+\"$
\n" ); document.write( " $\"+x+=+3+\"$
\n" ); document.write( " $\"+x+=+-3+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+z+=+-3+\"$
\n" ); document.write( " $\"+x%5E2+=+-3+\"$
\n" ); document.write( " $\"+x+=+sqrt%28-3+%29+\"$
\n" ); document.write( " $\"+x+=+sqrt%28-1%29%2Asqrt%283%29+\"$
\n" ); document.write( " $\"+x+=+sqrt%283%29%2Ai+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+x+=+-sqrt%283%29%2Ai+\"$
\n" ); document.write( "-----------------
\n" ); document.write( "The solutions are:
\n" ); document.write( " $\"+x+=+3+\"$
\n" ); document.write( " $\"+x+=+-3+\"$
\n" ); document.write( " $\"+x+=+sqrt%283%29%2Ai+\"$
\n" ); document.write( " $\"+x+=+-sqrt%283%29%2Ai+\"$ \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );