Question

determine as raizes de f(x)=-x+3
f(x)=-3x
f(x)= (x-1)² - (x+2)²

Answer 1

a)
f(x) = - x + 3
0 = - x + 3
x = 3
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b)
f(x) = - 3x
0 = - 3x
- 3x = 0
x = 0/- 3
x = 0
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c)

f(x) = (x - 1)² - (x + 2)²
0 = (x² - 2x + 1) - (x² + 2.2x + 4)
0 = x² - 2x + 1 - (x² + 4x + 4)
0 = x² - 2x + 1 - x² - 4x - 4
0 = x² - x² - 2x - 4x + 1 - 4
0 = - 6x - 3
6x = - 3 (:3)
2x = - 1
x = - 1/2