duyphan
21.10.2020 •
Mathematics
The square of 9 less than a number is 3 less than the number. What is the numeber?
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Ответ:
12 or 7
Step-by-step explanation:
Let the number be x, then (x - 9)^2 = x - 3
x^2 - 18x + 81 = x - 3
x^2 - 19x + 84 = 0
(x - 12)(x - 7) = 0
x = 12 or 7
Ответ:
The correct answer is C .
Step-by-step explanation: