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Roy123
@Roy123
December 2019
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Qual o valor de a^2-b+c?
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exalunosp
A = x - 3
B = x² + 3
C = 9x
A² - B + C =
( X - 3)² - ( X² + 3) + 9X
( X² - 2.3.X + 3² ) - ( X² +3) + 9X = 0
X² - 66X + 9 - X² - 3 + 9X = 0
- 57X + 6 = 0
57X - 6 = 0
57X = 6
X = 6/57 = 2/19 ***
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B = x² + 3
C = 9x
A² - B + C =
( X - 3)² - ( X² + 3) + 9X
( X² - 2.3.X + 3² ) - ( X² +3) + 9X = 0
X² - 66X + 9 - X² - 3 + 9X = 0
- 57X + 6 = 0
57X - 6 = 0
57X = 6
X = 6/57 = 2/19 ***