document.write( "Question 78831: How do I factor ?\r
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\n" ); document.write( "\n" ); document.write( "t (squared) -2t-8 {over} 4(-t squared) {multiplied by} t(squared)-5t+6 {over} t(squared)-t-12
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Algebra.Com's Answer #56558 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
Does your problem look like this?\r
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\n" ); document.write( "\n" ); document.write( "\"%28%28t%5E2-2t-8%29%2F%284-t%5E2%29%29%2A%28%28t%5E2-5t%2B6%29%2F%28t%5E2-t-12%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "In order to simplify this algebraic expression, we need to factor each term\r
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\n" ); document.write( "\n" ); document.write( "So lets factor the first numerator \"%28t%5E2-2t-8%29\"\r
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Solved by pluggable solver: Factoring Quadratics with a leading coefficient of 1 (a=1)
In order to factor \"1%2Ax%5E2%2B-2%2Ax%2B-8\", first we need to ask ourselves: What two numbers multiply to -8 and add to -2? Lets find out by listing all of the possible factors of -8
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\n" ); document.write( " Factors:
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\n" ); document.write( " 1,2,4,8,
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\n" ); document.write( " -1,-2,-4,-8,List the negative factors as well. This will allow us to find all possible combinations
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\n" ); document.write( " These factors pair up to multiply to -8.
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\n" ); document.write( " (-1)*(8)=-8
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\n" ); document.write( " (-2)*(4)=-8
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\n" ); document.write( " Now which of these pairs add to -2? Lets make a table of all of the pairs of factors we multiplied and see which two numbers add to -2
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First Number|Second Number|Sum
1|-8|1+(-8)=-7
2|-4|2+(-4)=-2
-1|8|(-1)+8=7
-2|4|(-2)+4=2
We can see from the table that 2 and -4 add to -2.So the two numbers that multiply to -8 and add to -2 are: 2 and -4\r\n" ); document.write( " \r\n" ); document.write( " Now we substitute these numbers into a and b of the general equation of a product of linear factors which is:\r\n" ); document.write( " \r\n" ); document.write( " \"%28x%2Ba%29%28x%2Bb%29\"substitute a=2 and b=-4\r\n" ); document.write( " \r\n" ); document.write( " So the equation becomes:\r\n" ); document.write( " \r\n" ); document.write( " (x+2)(x-4)\r\n" ); document.write( " \r\n" ); document.write( " Notice that if we foil (x+2)(x-4) we get the quadratic \"1%2Ax%5E2%2B-2%2Ax%2B-8\" again\n" ); document.write( "

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\n" ); document.write( "\n" ); document.write( "Now lets factor the 1st denominator \"%284-t%5E2%29\"\r
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\n" ); document.write( "\n" ); document.write( "Notice this is a difference of squares so we have \r
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\n" ); document.write( "\n" ); document.write( "\"%284-t%5E2%29=%282%2Bt%29%282-t%29\"\r
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\n" ); document.write( "\n" ); document.write( "Now lets factor the 2nd numerator \"%28t%5E2-5t%2B6%29\"\r
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Solved by pluggable solver: Factoring Quadratics with a leading coefficient of 1 (a=1)
In order to factor \"1%2Ax%5E2%2B-5%2Ax%2B6\", first we need to ask ourselves: What two numbers multiply to 6 and add to -5? Lets find out by listing all of the possible factors of 6
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\n" ); document.write( " Factors:
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\n" ); document.write( " 1,2,3,6,
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\n" ); document.write( " -1,-2,-3,-6,List the negative factors as well. This will allow us to find all possible combinations
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\n" ); document.write( " These factors pair up to multiply to 6.
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\n" ); document.write( " 1*6=6
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\n" ); document.write( " 2*3=6
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\n" ); document.write( " (-1)*(-6)=6
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\n" ); document.write( " (-2)*(-3)=6
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\n" ); document.write( " note: remember two negative numbers multiplied together make a positive number
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\n" ); document.write( " Now which of these pairs add to -5? Lets make a table of all of the pairs of factors we multiplied and see which two numbers add to -5
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First Number|Second Number|Sum
1|6|1+6=7
2|3|2+3=5
-1|-6|-1+(-6)=-7
-2|-3|-2+(-3)=-5
We can see from the table that -2 and -3 add to -5.So the two numbers that multiply to 6 and add to -5 are: -2 and -3\r\n" ); document.write( " \r\n" ); document.write( " Now we substitute these numbers into a and b of the general equation of a product of linear factors which is:\r\n" ); document.write( " \r\n" ); document.write( " \"%28x%2Ba%29%28x%2Bb%29\"substitute a=-2 and b=-3\r\n" ); document.write( " \r\n" ); document.write( " So the equation becomes:\r\n" ); document.write( " \r\n" ); document.write( " (x-2)(x-3)\r\n" ); document.write( " \r\n" ); document.write( " Notice that if we foil (x-2)(x-3) we get the quadratic \"1%2Ax%5E2%2B-5%2Ax%2B6\" again\n" ); document.write( "

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\n" ); document.write( "\n" ); document.write( "Now lets factor the 2nd denominator \"t%5E2-t-12\"\r
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Solved by pluggable solver: Factoring Quadratics with a leading coefficient of 1 (a=1)
In order to factor \"1%2Ax%5E2%2B-1%2Ax%2B-12\", first we need to ask ourselves: What two numbers multiply to -12 and add to -1? Lets find out by listing all of the possible factors of -12
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\n" ); document.write( " Factors:
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\n" ); document.write( " 1,2,3,4,6,12,
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\n" ); document.write( " -1,-2,-3,-4,-6,-12,List the negative factors as well. This will allow us to find all possible combinations
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\n" ); document.write( " These factors pair up to multiply to -12.
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\n" ); document.write( " (-1)*(12)=-12
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\n" ); document.write( " (-2)*(6)=-12
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\n" ); document.write( " (-3)*(4)=-12
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\n" ); document.write( " Now which of these pairs add to -1? Lets make a table of all of the pairs of factors we multiplied and see which two numbers add to -1
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First Number|Second Number|Sum
1|-12|1+(-12)=-11
2|-6|2+(-6)=-4
3|-4|3+(-4)=-1
-1|12|(-1)+12=11
-2|6|(-2)+6=4
-3|4|(-3)+4=1
We can see from the table that 3 and -4 add to -1.So the two numbers that multiply to -12 and add to -1 are: 3 and -4\r\n" ); document.write( " \r\n" ); document.write( " Now we substitute these numbers into a and b of the general equation of a product of linear factors which is:\r\n" ); document.write( " \r\n" ); document.write( " \"%28x%2Ba%29%28x%2Bb%29\"substitute a=3 and b=-4\r\n" ); document.write( " \r\n" ); document.write( " So the equation becomes:\r\n" ); document.write( " \r\n" ); document.write( " (x+3)(x-4)\r\n" ); document.write( " \r\n" ); document.write( " Notice that if we foil (x+3)(x-4) we get the quadratic \"1%2Ax%5E2%2B-1%2Ax%2B-12\" again\n" ); document.write( "

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\n" ); document.write( "\n" ); document.write( "So our whole expression factors to\r
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\n" ); document.write( "\n" ); document.write( " Notice these terms cancel\r
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\n" ); document.write( "\n" ); document.write( "So we're left with\r
\n" ); document.write( "\n" ); document.write( "\"%28%28t-3%29%28t-2%29%29%2F%28%282-t%29%28t%2B3%29%29\"\r
\n" ); document.write( "\n" ); document.write( "Now factor out a -1 to make t-2 become 2-t\r
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\n" ); document.write( "\n" ); document.write( "\"-%28%28t-3%29%282-t%29%29%2F%28%282-t%29%28t%2B3%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"-%28%28t-3%29cross%28%282-t%29%29%29%2F%28cross%28%282-t%29%29%28t%2B3%29%29\" Notice these terms cancel\r
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\n" ); document.write( "So the whole thing reduces to \r
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\n" ); document.write( "\n" ); document.write( "\"-%28t-3%29%2F%28t%2B3%29\"
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