Question

dada a função f(x)=x2+5x-2, calcule f(5).
dada a função g(x)=2x2-3x+6, caucule g(2).
dada a função h(x)=5x-20, caucule h(4).

Answer 1

$f(5) = {5}^{2} + 5 \times 5 - 2 \\ f(5) = 25 + 25 - 2 \\ f(5) = 48$
$g(2) =2 \times {(2)}^{2} - 3 \times 2 + 6 \\ g(2) = 2 \times 4 - 6 + 6 \\ g(2) = 8$
$h(4) = 5 \times 4 - 20 \\ h (4) = 20 - 20 \\ h(4) = 0$