Question

4) Dada a função f: r-r, definido por f(x)=x^2 – 7x + 12, calcule:


d) F (- ½)=

Answer 1

Oie, Td Bom?!

$f(x) = x {}^{2} - 7x + 12$

$f( - \frac{1}{2} ) = ( - \frac{1}{2} ){}^{2} - 7 \: . \: ( - \frac{1}{2} ) + 12$

$f( - \frac{1}{2} ) = \frac{1}{4} + \frac{7}{2} + 12$

$f( - \frac{1}{2} ) = \frac{1 + 14 + 48}{4}$

$f( - \frac{1}{2} ) = \frac{63}{4}$

Att. Makaveli1996

Answer 2

Resposta:

$f( - \frac{ 1}{2} ) = \frac{63}{4}$

Explicação passo-a-passo:

$f(x) = {x}^{2} - 7x + 12 \\ f( - \frac{1}{2} ) = ( - \frac{1}{2} {)}^{2} - 7 \times ( - \frac{1}{2} ) + 12 \\ f( - \frac{ 1}{2} ) = \frac{1}{4} + \frac{7}{2} + 12 \\ f( - \frac{ 1}{2} ) = \frac{1 + 14 + 48}{4} \\ f( - \frac{ 1}{2} ) = \frac{63}{4}$