document.write( "Question 480707: I can't solve this.
\n" ); document.write( "15x^4 - 28x^2 + 5=0
\n" ); document.write( "The solution is x=__ \n" ); document.write( "

Algebra.Com's Answer #329175 by MathLover1(20849) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"15x%5E4+-28x%5E2+%2B+5=0\"$ ..........replace $\"-28x%5E2\"$ with $\"-25x%5E2-3x%5E2\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"15x%5E4+-25x%5E2-3x%5E2+%2B+5=0\"$ ......group\r
\n" ); document.write( "\n" ); document.write( " $\"5x%5E2%283x%5E2-5%29+-%283x%5E2+-+5%29=0\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%285x%5E2+-1%29%283x%5E2+-5%29=0\"$ \r
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\n" ); document.write( " $\"5x%5E2+-1=0\"$ , then $\"5x%5E2+=1\"$ ...->.. $\"x%5E2+=1%2F5\"$ ...->.. $\"x+=sqrt%281%2F5%29\"$ \r
\n" ); document.write( "\n" ); document.write( "..->.. $\"x+=1%2Fsqrt%285%29\"$ ..->.. $\"x+=1sqrt%285%29%2F%28sqrt%285%29sqrt%285%29%29\"$ ..->..\r
\n" ); document.write( "\n" ); document.write( " $\"x+=sqrt%285%29%2F5\"$ or $\"x+=-sqrt%285%29%2F5\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"3x%5E2+-5=0\"$ ..->.. $\"3x%5E2=5\"$ ..->.. $\"x%5E2=5%2F3\"$ ..->..\r
\n" ); document.write( "\n" ); document.write( " $\"x=sqrt%285%2F3%29\"$ or $\"x=-sqrt%285%2F3%29\"$ \r
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