document.write( "Question 1029499: What is the answer to negative B plus a minus of square root of B squared square- 4AC over 2A \n" ); document.write( "

Algebra.Com's Answer #644517 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
That is called the quadratic formula. Here it is:
\n" ); document.write( " $\"+x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( "Because of the + and - before the square root sign,
\n" ); document.write( "you get two x's, you can call them $\"+x%5B1%5D+\"$ and $\"+x%5B2%5D+\"$
\n" ); document.write( "They are the roots of the quadratic
\n" ); document.write( "-------------
\n" ); document.write( "You get the a, b, and c from the general form of the quadratic:
\n" ); document.write( " $\"+a%2Ax%5E2+%2B+b%2Ax+%2B+c+=+0+\"$
\n" ); document.write( "-------------
\n" ); document.write( "Here's an example, and it's plot:
\n" ); document.write( " $\"+f%28x%29+=+x%5E2+%2B+x+%2B+1%2F4+\"$
\n" ); document.write( "Set $\"+f%28x%29+=+0+\"$ to get roots:
\n" ); document.write( " $\"+x%5E2+%2B+x+%2B+1%2F4+=+0+\"$
\n" ); document.write( " $\"+a+=+1+\"$
\n" ); document.write( " $\"+b+=+1+\"$
\n" ); document.write( " $\"+c+=+1%2F4+\"$
\n" ); document.write( "Plot:
\n" ); document.write( " $\"+graph%28+400%2C+400%2C+-4%2C+4%2C+-10%2C+10%2C+x%5E2+%2B+x+%2B+1%2F4+%29+\"$
\n" ); document.write( "Note that there is just 1 root ( where the curve touches the x-axis )
\n" ); document.write( "This is because $\"+b%5E2+=+4%2Aa%2Ac+\"$ \n" ); document.write( "

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