document.write( "Question 541682: Solve:\r
\n" ); document.write( "\n" ); document.write( "z^4-5z^2+4=0 \n" ); document.write( "
Algebra.Com's Answer #354244 by acolunga3(2)\"\" \"About 
You can put this solution on YOUR website!
quadratic equations -b = +/- the Square root of b^2 -4*a*c
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\n" ); document.write( " all over 2a\r
\n" ); document.write( "\n" ); document.write( "so a=1 for z b=5 and C=4\r
\n" ); document.write( "\n" ); document.write( " now, -5 +/- square root: -5^2 -4*1*4 all equals
\n" ); document.write( " = -25 +/- squ.root 25-4(1)(4)
\n" ); document.write( " = -25 +/- squ.root 9 all over(which means divided by)2(1)\r
\n" ); document.write( "\n" ); document.write( "so now, -25 +/- squ.root 9
\n" ); document.write( "-------------------------- :the squ root of 9 is 3, cuz 3^2=9:
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\n" ); document.write( "\n" ); document.write( " = -25 +/- 3
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\n" ); document.write( " 2 => now divide by 2 to get: (sorry so long, i like steps)\r
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\n" ); document.write( "\n" ); document.write( "- 25/2 +/- 3/2 or -12.5 +/- 3/2
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