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Factoring Trinomials using common factors. Remember – always check for GCF first!! Factor out everything that ALL terms have in common. In this case,

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Presentation on theme: "Factoring Trinomials using common factors. Remember – always check for GCF first!! Factor out everything that ALL terms have in common. In this case,"— Presentation transcript:

1 Factoring Trinomials using common factors

2 Remember – always check for GCF first!! Factor out everything that ALL terms have in common. In this case, all numbers are even so they have a 2 in common, and each term has at least 1 x. Now, use the tic-tac-toe method on the trinomial. This sign tells you to Subtract The factors. This signs shows The sign of the Larger factor Don’t forget to check yourself, multiply ACROSS (L to R) all rows and UP all columns to see if you get the correct products. Now bring down your GCF!!!

3 Remember – always check for GCF first!! Factor out everything that ALL terms have in common. In this case, all numbers have a 3 in common, and each term has at least 1 x. Now, use the tic-tac-toe method on the trinomial. This sign tells you to Subtract The factors. This signs shows The sign of the Larger factor Don’t forget to check yourself, multiply ACROSS (L to R) all rows and UP all columns to see if you get the correct products. Now bring down your GCF!!!

4 Factor out EVERYTHING that ALL terms have in common. The numbers have 3 in common. What is the smallest exponent for “x”? So, each term has 2x’s in common. What is the smallest exponent on the “y”? So each term has 1 y in common. Now divide out the number and subtract the variables exponents. Now, use the tic-tac-toe method on the trinomial. (1)(20) (2)(10) (4)(5) Which one will subtract to give +8? (1)(4) or (2)(2) Which one? Multiply across the row for help! Now bring down your GCF!!!

5 Factor out EVERYTHING that ALL terms have in common. Now divide out the number and subtract the variables exponents Now, use the tic-tac-toe method on the trinomial. (1)(6) or (2)(3) ??? Now bring down your GCF!!!

6 What is different about this problem? When the leading term is negative, just factor out a negative number to make it positive!!!. Factor out EVERYTHING that ALL terms have in common. Now divide out the negative number!! Now, use the tic-tac-toe method on the trinomial. (1)(90) (2)(45) (3)(30) (5)(18) (6)(15) yes Now bring down your GCF!!!

7 When the leading term is negative, just factor out a negative number to make it positive!!!. Factor out EVERYTHING that ALL terms have in common. Now divide out the negative number!! Now, use the tic-tac-toe method on the trinomial. (1)(120) (2)(60) (3)(40) (4)(30) (5)(24) (6)(20) (8)(15) Yes (1)(20) (2)(10) (4)(5) yes – Look at last column. Now bring down your GCF!!!


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