document.write( "Question 892808: how do you justify each step of this problem (12+8x)+13 \n" ); document.write( "

Algebra.Com's Answer #540838 by AnlytcPhil(1806) $\"\"$ $\"About$

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document.write( "Use the commutative principle of addition to interchange the 12 and the 8x\r\n" );
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document.write( "Use the associative principle of addition to move the parentheses from around\r\n" );
document.write( "the first two terms to around the last two terms:\r\n" );
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document.write( "Now we can add the 12+13 and get 25 instead of (12+13)\r\n" );
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document.write( "That's it.\r\n" );
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document.write( "Edwin

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