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Keegan
Mathematics
10 May, 04:51
Factor the given polynomial.
3x² + 5x - 12
+4
Answers (
1
)
Frances Spears
10 May, 05:17
0
= (x + 3) (3 x - 4)
Step-by-step explanation:
Use a version of the AC Method.
A = 3, B = 5, C = 12
Since the sign on the constant term is -, look for a pair of factors of A C = 36 whose difference is B = 5
The pair 4, 9 works.
Now use that pair to split the middle term, then factor by grouping:
3 x 2 + 5 x - 12 = 3 x
- 4 x + 9 x - 12 = (3 x 2 - 4 x) + (9 x - 12) = x (3 x - 4) + 3 (3 x - 4)
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