document.write( "Question 438360: I am working on a quadratic equation. A=3, B=6, C=-4. I have worked the problem out to the point that x=-6 + sqrt 84. I reduced the problem to -6+2(sq rt 21) over 6. The text key says that it can be further reduced to -3+sqrt21 over 3, but I just cannot see how they get from my answer to theirs. Can you explain? \n" ); document.write( "

Algebra.Com's Answer #303170 by nerdybill(7384) $\"\"$ $\"About$

You can put this solution on YOUR website!
That's because instead of:
\n" ); document.write( "-6+2(sq rt 21) over 6
\n" ); document.write( "you should have:
\n" ); document.write( "-6+2(sq rt 21) over 12
\n" ); document.write( ".
\n" ); document.write( "Then, you can divide numerator and denominator by 2 to get:
\n" ); document.write( "-3+(sq rt 21) over 3
\n" ); document.write( ".
\n" ); document.write( "In the quadratic formula, the denominator is 'a' times 'c'
\n" ); document.write( " \n" ); document.write( "

\n" );