Question

Seja a função quadrática f(x) = 3x2 – 5x + 4, calculANDO: f(-1) e f(-2), encontramos os valores:​

Answer 1

$\boxed{f(x) = 3x {}^{2} - 5x + 4}$

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$\boxed{x = - 1}$

$f( - 1) = 3 \: . \: ( - 1) {}^{2} - 5 \: . \: ( - 1) + 4$

$f( -1 ) = 3 \: . \: 1 + 5 + 4$

$f( - 1) = 3 + 5 + 4$

$f( - 1) = 8 + 4$

$\boxed{f( - 1) =1 2}$

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$\boxed{x = - 2 }$

$f( - 2) = 3 \: . \: ( - 2) {}^{2} - 5 \: . \: ( - 1) + 4$

$f( - 2) = 3 \: . \: 4 + 10 +4$

$f( - 2) = 12 + 10 + 4$

$f( - 2) = 22 + 4$

$\boxed{f( - 2) =26}$

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Answer 2

Explicação passo-a-passo:

$3x {}^{2} - 5x + 4$

$f( - 1) = 3 \times ( - 1) {}^{2} - 5 \times - 1 + 4 = \\ 3 \times 1 + 5 + 4 = 3 + 5 + 4 = 12$

$f( - 2) = 3 \times ( - 2) {}^{2} - 5 \times - 2 + 4 = \\ 3 \times 4 + 10 + 4 = 12 + 10 + 4 = 26$