Question

dada a função f (x) 3x²-2x-1 calcule :
a ) f(0)
b) f(3)
c)f(-2)

Answer 1

A) f(0)

3x²-2x-1
3(0) ² - 2(0) - 1
0 - 0 - 1
f(0) = -1

B) f(3)

3x²-2x-1
3(3) ²- 2(3) -1
27 - 6 -1
27 - 7
20
f(3) = 20

C) f(-2)

3x²-2x-1
3(-2) ²-2(-2)-1
12 + 4 -1
16 - 1
15
f(-2) = 15

Answer 2

f(x) =  3x² - 2x - 1 calcule :
a )
f(0)  = 3.0² - 2.0 - 1 = 0 - 0 - 1 = - 1

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b)
f(3) = 3.3² - 2.3 - 1 = 3.9 - 6 - 1 = 27 - 7 = 20

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c)
f(-2) = 3.(-2)² - 2.(-2) - 1 = 3.4 + 4 - 1 = 12 + 3 = 15