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Warmup. Find the GCF for #1. Factor #s 2-4. 1. 2. 3. 4. Homework Questions?. Pg. 579. 10-3 Factoring Trinomials. Objective: To identify a prime trinomial and to factor a trinomial completely. Standard 11.0. Example 1. 1 st • 3 rd. Factor out the GCF first!. Factor completely.
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Warmup Find the GCF for #1. Factor #s 2-4. 1. 2. 3. 4
Homework Questions? • Pg. 579
10-3 Factoring Trinomials Objective: To identify a prime trinomial and to factor a trinomial completely. Standard 11.0
Example 1 1st•3rd Factor out the GCF first! Factor completely. 18x2 + 21x + 6 3(6x2 + 7x + 2) 2nd 2x 1 12 6x2 3x 3x 4 3 7 2 4x 2 3(3x + 2)(2x + 1) Pick 2 #s that multiply to get the top and add to get the bottom. Those go on the sides of the X. Don’t forget the 3 out front!
What about this?... • #36 on tonight’s homework: There are no numbers that multiply to get -15 and add to get -3… So you write PRIME -15 ? ? -3
Homework • Pg. 579 # 36, 38-45 Do your homework!
Helpful X hints… (again) + + + + - - + - - - + big - small - big + small + -