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Messiah Whitney
Mathematics
11 June, 15:25
What is the factored form of x2 - 12x - 45?
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Emilee
11 June, 15:45
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(x - 15) (x + 3)
Step-by-step explanation:
Factors of 45 include 5 and 9, 3 and 15, 1 and 45, and so on.
Note that 3*15 = + 45; this is not what we wanted. Thus, try (-3) * 15 = - 45.
Do - 3 and 15 combine to yield - 12? No. Thus drop (-3) (15) and try (3) (-15).
Do 3 and - 15 combine to yield - 12? YES
Therefore, the factored form of x² - 12x - 45 is (x - 15) (x + 3).
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