document.write( "Question 365540: x2 - x - 6 =\r
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document.write( "Simplified. I know the answer is (x+2)(x-3), but I don't understand how the answer was achieved. Can I please get an explanation of this? \n" );
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Algebra.Com's Answer #260584 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! x^2 - x - 6 = \n" ); document.write( "Simplified. I know the answer is (x+2)(x-3), but I don't understand how the answer was achieved. Can I please get an explanation of this? \n" ); document.write( "------ \n" ); document.write( "You have to understand FOIL. \n" ); document.write( "When you multiply two binomials you establish a pattern. \n" ); document.write( "(x+a)(x+b) = x^2 + (a+b)x + ab \n" ); document.write( "---- \n" ); document.write( "Notice that the ab is a product of a and b \n" ); document.write( "and a+b is the sum of the same numbers. \n" ); document.write( "----- \n" ); document.write( "Your Problem \n" ); document.write( "-6 is the product of two numbers \n" ); document.write( "-1 is the sum of the same numbers \n" ); document.write( "---- \n" ); document.write( "Thinking about it you need to arrive \n" ); document.write( "at the right numbers; they are -3 and +2. \n" ); document.write( "-- \n" ); document.write( "So you can rewrite your problem as follows: \n" ); document.write( "x^2 -3x+2x -6 \n" ); document.write( "--- \n" ); document.write( "Now factor the 1st two and the last two terms \n" ); document.write( "separately to get: \n" ); document.write( "x(x-3)+2(x-3) \n" ); document.write( "--- \n" ); document.write( "Then you need to factor again to get: \n" ); document.write( "(x-3)(x+2) which is the answer you need. \n" ); document.write( "==================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " \n" ); document.write( " |