document.write( "Question 621727: Find all zeros of the function and write the polynomial as a product of linear factors.\r
\n" ); document.write( "\n" ); document.write( "f(x)=x^4+13x^2+36\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Mult choice answers:
\n" ); document.write( "A) f(x)=(x+i)(x-i)(x+6i(x-6i)
\n" ); document.write( "B) f(x)=(x+2i)^2(x+3i)^2
\n" ); document.write( "C) f(x)=(x+2+3i)^2(x+2-3i)^2
\n" ); document.write( "D) f(x)=(x+2i)(x-2i)(x+3i)(x-3i) \n" ); document.write( "
Algebra.Com's Answer #390908 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
 
\n" );
document.write( "Hi,
\n" );
document.write( "f(x)=x^4+13x^2+36    || Let X = x^2
\n" );
document.write( "f(X) = X^2 + 13X + 36
\n" );
document.write( "\"X+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" );
document.write( "\"X+=+%28-13+%2B-+sqrt%28+169-144+%29%29%2F%282%29+\"
\n" );
document.write( "\"X+=+%28-13+%2B-+sqrt%28+25+%29%29%2F%282%29+\"
\n" );
document.write( "\"X+=+%28-13+%2B-+5%29%2F%282%29+\"
\n" );
document.write( "   X = -9 or X = -4
\n" );
document.write( "   x^2 = -9
\n" );
document.write( "   x = ± 3i
\n" );
document.write( "   x^2 = -4
\n" );
document.write( "   x = ± 2i
\n" );
document.write( "D) f(x)=(x+2i)(x-2i)(x+3i)(x-3i) \n" );
document.write( "
\n" );