document.write( "Question 1025983: x^4=7(x^2)+18\r
\n" ); document.write( "\n" ); document.write( "Solve for x. \n" ); document.write( "

Algebra.Com's Answer #641254 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"x%5E4=7%28x%5E2%29%2B18\"$
\n" ); document.write( "Solve for x.
\n" ); document.write( "Arrange as a quadratic equation
\n" ); document.write( " $\"x%5E4+-+7x%5E2+-+18+=+0+\"$
\n" ); document.write( "Factor
\n" ); document.write( " $\"%28x%5E2-9%29%28x%5E2%2B2%29+=+0\"$
\n" ); document.write( "The positive solution is what we want here
\n" ); document.write( " $\"x%5E2+=+9\"$
\n" ); document.write( "Two solutions
\n" ); document.write( " $\"x+=+sqrt%289%29\"$
\n" ); document.write( "x = 3
\n" ); document.write( "and
\n" ); document.write( " $\"x+=+-sqrt%289%29\"$
\n" ); document.write( "x = -3
\n" ); document.write( ":
\n" ); document.write( "looks like this
\n" ); document.write( " $\"+graph%28+300%2C+200%2C+-6%2C+6%2C+-50%2C+50%2C+x%5E4-7x%5E2-18%29+\"$ \n" ); document.write( "

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