document.write( "Question 134920: 3x^2+7=31
\n" ); document.write( "7n^2-6=15
\n" ); document.write( "5x^2-12=5
\n" ); document.write( "what does x = \n" ); document.write( "

Algebra.Com's Answer #98919 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

You can put this solution on YOUR website!
Solve these using basic algebra operations
\n" ); document.write( ":
\n" ); document.write( "3x^2 + 7 = 31
\n" ); document.write( "3x^2 = 31 - 7; subtract 7 from both sides
\n" ); document.write( "3x^2 = 24
\n" ); document.write( "x^2 = 24/3; divide both sides by 3
\n" ); document.write( "x^2 = 8
\n" ); document.write( "x = +/-Sqrt(8); find the square root of both sides
\n" ); document.write( "x = +/-Sqrt(4*2); factor out 4, a perfect square
\n" ); document.write( "x = +/- $\"2%2Asqrt%282%29\"$ ; extract the square root of 4
\n" ); document.write( ":
\n" ); document.write( "7n^2 - 6 = 15
\n" ); document.write( "7n^2 = 15 + 6
\n" ); document.write( "7n^2 = 21
\n" ); document.write( "n^2 = 21/7
\n" ); document.write( "n^2 = 3
\n" ); document.write( "n = +/- $\"sqrt%283%29\"$
\n" ); document.write( ":
\n" ); document.write( "5x^2 - 12 = 5
\n" ); document.write( "5x^2 = 5 + 12
\n" ); document.write( "5x^2 = 17
\n" ); document.write( "x^2 = 17/5
\n" ); document.write( "x = +/- $\"sqrt%2817%2F5%29\"$ \n" ); document.write( "

\n" );