greend0719
29.06.2019 •
Mathematics
Solve the equation by factoring. z2 − 6z − 27 = 0 a.z = –3 or z = 9 b.z = –3 or z = –9 c.z = 3 or z = 9 d.z = 3 or z = –9
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Ответ:
The answer is x= 9 and -3
You must fine 2 number that multiply to equal -27 and add to equal -6
(x-9) (x+3)
Then equal the parts of the binomial to zero
x - 9 = 0
x + 3 = 0
You must get x by its self.
When you do so, you'll have the answer as -3 and 9
Step-by-step explanation:
Ответ: