document.write( "Question 337791: factor\r
\n" ); document.write( "\n" ); document.write( "3s^2-14s+8\r
\n" ); document.write( "\n" ); document.write( "9v^2+11v+4\r
\n" ); document.write( "\n" ); document.write( "4r^2-22r+10\r
\n" ); document.write( "\n" ); document.write( "b^2-1/2
\n" ); document.write( "

Algebra.Com's Answer #242200 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
Please only post one problem at a time.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Looking at \"3s%5E2-14s%2B8\" we can see that the first term is \"3s%5E2\" and the last term is \"8\" where the coefficients are 3 and 8 respectively.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Now multiply the first coefficient 3 and the last coefficient 8 to get 24. Now what two numbers multiply to 24 and add to the middle coefficient -14? Let's list all of the factors of 24:\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Factors of 24:\r
\n" ); document.write( "\n" ); document.write( "1,2,3,4,6,8,12,24\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "-1,-2,-3,-4,-6,-8,-12,-24 ...List the negative factors as well. This will allow us to find all possible combinations\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "These factors pair up and multiply to 24\r
\n" ); document.write( "\n" ); document.write( "1*24\r
\n" ); document.write( "\n" ); document.write( "2*12\r
\n" ); document.write( "\n" ); document.write( "3*8\r
\n" ); document.write( "\n" ); document.write( "4*6\r
\n" ); document.write( "\n" ); document.write( "(-1)*(-24)\r
\n" ); document.write( "\n" ); document.write( "(-2)*(-12)\r
\n" ); document.write( "\n" ); document.write( "(-3)*(-8)\r
\n" ); document.write( "\n" ); document.write( "(-4)*(-6)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "note: remember two negative numbers multiplied together make a positive number\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Now which of these pairs add to -14? Lets make a table of all of the pairs of factors we multiplied and see which two numbers add to -14\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\n" ); document.write( "\n" ); document.write( "
First NumberSecond NumberSum
1241+24=25
2122+12=14
383+8=11
464+6=10
-1-24-1+(-24)=-25
-2-12-2+(-12)=-14
-3-8-3+(-8)=-11
-4-6-4+(-6)=-10
\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "From this list we can see that -2 and -12 add up to -14 and multiply to 24\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Now looking at the expression \"3s%5E2-14s%2B8\", replace \"-14s\" with \"-2s%2B-12s\" (notice \"-2s%2B-12s\" adds up to \"-14s\". So it is equivalent to \"-14s\")\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"3s%5E2%2Bhighlight%28-2s%2B-12s%29%2B8\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Now let's factor \"3s%5E2-2s-12s%2B8\" by grouping:\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%283s%5E2-2s%29%2B%28-12s%2B8%29\" Group like terms\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"s%283s-2%29-4%283s-2%29\" Factor out the GCF of \"s\" out of the first group. Factor out the GCF of \"-4\" out of the second group\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%28s-4%29%283s-2%29\" Since we have a common term of \"3s-2\", we can combine like terms\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So \"3s%5E2-2s-12s%2B8\" factors to \"%28s-4%29%283s-2%29\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So this also means that \"3s%5E2-14s%2B8\" factors to \"%28s-4%29%283s-2%29\" (since \"3s%5E2-14s%2B8\" is equivalent to \"3s%5E2-2s-12s%2B8\")\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "------------------------------------------------------------\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " Answer:\r
\n" ); document.write( "\n" ); document.write( "So \"3s%5E2-14s%2B8\" factors to \"%28s-4%29%283s-2%29\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "If you need more help, email me at jim_thompson5910@hotmail.com\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Also, feel free to check out my tutoring website. \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Jim\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );