Question

f (x)=x2+x+2 e g(x)=-3x2-5x+1 ​

Answer 1

Resposta:

f(x) = 2x² - 6x - 4

g(x) = - 3x² - 5x + 1

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a)

f(x) = 2x² - 6x - 4

f(3) = 2.3² - 6.3 - 4

f(3) = 2.9 - 18 - 4

f(3) = 18 - 18 - 4

f(3) = 0 - 4

f(3) = - 4

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b)

f(x) = 2x² - 6x - 4

f(-2) = 2.(-2)² - 6.(-2) - 4

f(-2) = 2.4 + 12 - 4

f(-2) = 8 + 8

f(-2) = 16

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c)

f(x)=2x² - 6x -4  

f(0) = 2.0² - 6.0 - 4

f(0) = 2.0 - 0 - 4

f(0) = 0 - 0 - 4

f(0) = - 4

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d) f(- 0,2)

f(x)= 2x² - 6x - 4  

f( - 0,2) = 2.(-0,2)² - 6.(-0,2) - 4

f( - 0,2) = 2. (0,04) + 1,2 - 4

f( - 0,2) = 0,08 + 1,2 - 4

f( - 0,2) = - 2,72

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e)

g(x)= - 3x² - 5x +1

g(1) = - 3.1² - 5.1 + 5

g(1) = - 3.1 - 5 + 5

g(1) = - 3 - 5 + 5

g(1) = - 3

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f)

g(x) = - 3x² - 5x + 1

g(-4) = - 3. (-4) - 5.(-4) + 1

g( - 4) = 12 + 20 + 1

g( - 4) = 32 + 1

g(-4) = 33  

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g)

g(x)=-3x²-5x+1

g(0) = - 3.0² - 5.0 + 1

g(0) = - 3.0 - 0 + 1

g(0) = 0 - 0 + 1

g(0) = 1

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h)

g(x) = - 3x² - 5x + 1

g(1/2) = - 3 . 1²  - 5.1  + 1

                  2²      2

g(1/2) = - 3  - 5  + 1

             4   2

g(1/2) =  - 3 - 10 + 4  

                   4

g (1/2) = - 13 + 4

                  4

g(1/2) = - 9

               4

Espero ter ajudado❤❤❤❤❤❤❤