document.write( "Question 365540: x2 - x - 6 =\r
\n" ); document.write( "\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?
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Algebra.Com's Answer #260584 by stanbon(75887)\"\" \"About 
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?
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\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
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\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.
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\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
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\n" ); document.write( "Thinking about it you need to arrive
\n" ); document.write( "at the right numbers; they are -3 and +2.
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\n" ); document.write( "So you can rewrite your problem as follows:
\n" ); document.write( "x^2 -3x+2x -6
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\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)
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\n" ); document.write( "Then you need to factor again to get:
\n" ); document.write( "(x-3)(x+2) which is the answer you need.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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