document.write( "Question 622284: How do I solve 100x^4=-400x^3+2100x^2 ? \n" ); document.write( "

Algebra.Com's Answer #391266 by matineesuxxx(27) $\"\"$ $\"About$

You can put this solution on YOUR website!
bring everything to one side, factor out an $\"x%5E2\"$ and solve like a normal quadratic. \r
\n" ); document.write( "\n" ); document.write( "basically, this is what you do.\r
\n" ); document.write( "\n" ); document.write( " $\"100x%5E4%2B400x%5E3-2100x%5E2=0\"$
\n" ); document.write( " $\"100x%5E2%28x%5E2%2B4x-21%29=0\"$
\n" ); document.write( " $\"100x%5E2%28%28x%5E2%2B7x%29%2B%28-3x-21%29%29=0\"$
\n" ); document.write( " $\"100x%5E2%28x%28x%2B7%29-3%28x%2B7%29%29=0\"$ ----> now in this step i noticed that if i factor out an x from the first bracket, and a -3 from the second bracket, then i would end up with an (x+7) as a common factor, so then i could do this:
\n" ); document.write( " $\"100x%5E2%28x-3%29%28x%2B7%29=0\"$
\n" ); document.write( "therefore X= -7, 0, and 3 \n" ); document.write( "

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