document.write( "Question 887314: Solve the equation by making an appropriate substitution. (Don't forget imaginary solutions)
\n" ); document.write( "x(exponent 4) + 2x(exponent 2) -8 =0 \n" ); document.write( "
Algebra.Com's Answer #536516 by lwsshak3(11628)\"\" \"About 
You can put this solution on YOUR website!
x(exponent 4) + 2x(exponent 2) -8 =0
\n" ); document.write( "x^4+2x^2-8=0
\n" ); document.write( "(x^2+4)(x^2-2)=0
\n" ); document.write( "..
\n" ); document.write( "x^2+4=0
\n" ); document.write( "x^2=-4
\n" ); document.write( "x=±√-4=±2i
\n" ); document.write( "or
\n" ); document.write( "x^2-2=0
\n" ); document.write( "x^2=2
\n" ); document.write( "x=±√2 \n" ); document.write( "
\n" );