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inkyvoyd
 one year ago
Best ResponseYou've already chosen the best response.1Comon @mitchelsewbaran that doesn't help anyone. Give him a hint :)

tpenn
 one year ago
Best ResponseYou've already chosen the best response.0what are the steps it took to get to that answer?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0One way to factor a trinomial like this is to follow the following steps. This method involves some guessing and trial and error. 1. Set up two sets of parentheses: ( )( ) 2. On the left side of each parentheses, write two factors of the first term, 3x^2. The factors of 3x^2 are 3x and x: (3x )(x ) 3. On the right side of the parentheses, write 2 factors of 20. Here's where you need to do some trial and error. The factors of 20 are: 20, 1 1, 20 4, 5 4, 5 2, 10 2, 10 In addition, each of those guesses can be placed two ways, for example, if you use 4 and 5, you can place them these ways: (3x + 4)(x  5) and (3x  5)(x + 4) How do you know which version works? Do OI of FOIL and add the two terms. Whichever choice of factors that gives you the middle term is the correct one. With (3x + 4)(x  5), OI is 15x + 4x = 11x (Doesn't work) With (3x  5)(x + 4), OI is 12x  5x = 7x (dosen't work. Let's try 2, 10 (3x + 2)(x  10) OI is 30x + 2x = 28x (doesn't work) (3x  10)(x + 2) OI is 6x  10x = 4x (Works!) Therefore, 3x^2  4x  20 = (3x  10)(x + 2) There is another method called factoring by parts that invloves less guessing. I can show you that too, if you're interested.
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