document.write( "Question 1207907: Which of the expressions is not equal to the other three?\r
\n" ); document.write( "\n" ); document.write( "A. 7[a +2]\r
\n" ); document.write( "\n" ); document.write( "B. 20 + 8a -6 -a\r
\n" ); document.write( "\n" ); document.write( "C.17 +3[a -1] + 4a\r
\n" ); document.write( "\n" ); document.write( "D. 2a + 5[a -1] + 8 \n" ); document.write( "

Algebra.Com's Answer #846039 by ikleyn(52787) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "Which of the expressions is not equal to the other three?
\n" ); document.write( "A. 7[a +2]
\n" ); document.write( "B. 20 + 8a -6 -a
\n" ); document.write( "C.17 +3[a -1] + 4a
\n" ); document.write( "D. 2a + 5[a -1] + 8
\n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~~~~\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "One way to solve this problem is to simplify each expression to its simplest form\r\n" );
document.write( "and compare them.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "I will use another way. I will quickly calculate in my head the value of each expression for a = 0.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "(A)  gives the value of 14.\r\n" );
document.write( "\r\n" );
document.write( "(B)  gives the value of 14.\r\n" );
document.write( "\r\n" );
document.write( "(C)  gives the value of 14.\r\n" );
document.write( "\r\n" );
document.write( "(D)  gives the value of  3.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "So, I conclude that expression (D) is not equal to (is different from) other three.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );