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likecrazy143
Group Title
What is the expression in factored form?
x^2 + 13x + 42
 2 years ago
 2 years ago
likecrazy143 Group Title
What is the expression in factored form? x^2 + 13x + 42
 2 years ago
 2 years ago

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henryrodriguez713 Group TitleBest ResponseYou've already chosen the best response.0
(x+6)(x+7)
 2 years ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.0
How did you get that, @henryrodriguez713 ? ( http://openstudy.com/codeofconduct )
 2 years ago

appleduardo Group TitleBest ResponseYou've already chosen the best response.0
6+7 = 13, 6*7 = 42 :P so henry is right, thats the factored form
 2 years ago

henryrodriguez713 Group TitleBest ResponseYou've already chosen the best response.0
Sorry! Went to shower. Umm... This should help you with remembering the process of factoring quadratics. AND just know that if there is no "a" it's understood to represent 1 and if it's 1 you don't really have to divide, since 6/1 is 6. \[f(x)=ax^2 + bx +c\] MFDARM: My M:ultiply by a*c Father F:ind the factors of ac that add to b Drives D:ivide by a A This a < Red R:educe fractions Mustang M:ake into factors: put x on bottom and read up. \[f(x)=ax^2 + bx +c\] \[f(x)=x^2 + 13x + 42\] a=1 b=13 c=42 (Note: there is always an invisible 1 at "a") M: 1*42=42 F: 42 ** (NOTE: While getting the factors, add them and see if they add to 13)** 1 * 42 (1+42=43) NOT A FACTOR; doesn't add to 13 2 * 21 (2+42= 44) NOT A FACTOR; doesn't add to 13 3 * 14 (3+14=17) NOT A FACTOR; doesn't add to 13.( @thispointyouknowyou're close 6 * 7 (6+7=14) DING! DING! DING! Now divide by "a" \[\frac{ 6}{ 1x} \frac{ 7 }{ 1x }\] = (x+6)(x+7) So, (x+6)(x+7) and if you work it out you see it adds back to the original equation. NOTE: I know it doesn't make sense to divide by a, but it will help when a is 5 or 6 or 9 and so on.
 2 years ago
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