Question

URGENTE: Dada a função f, tal que f(x) = -x^2 + 5x + 6, calcule: F( menos quatro sobre cinco)

Answer 1

f(x) = -x²+5x+6

f(-4/5) = -(-4/5)²+5*(-4/5)+6

f(-4/5) = -16/25 -4 +6

f(-4/5) = -16/25 +2

f(-4/5) = (50-16)/25

f(-4/5) = 34/25

Answer 2

$f(x) = -x^{2} + 5x + 6\\ \\ f(-\frac{4}{5}) = -(-\frac{4}{5})^{2} + 5(-\frac{4}{5}) + 6 \\ \\ f(-\frac{4}{5}) = -(\frac{16}{25}) -4 + 6 \\ \\ f(-\frac{4}{5}) = -\frac{16}{25} +2 \\ \\ f(-\frac{4}{5}) = \frac{-16+50}{25}\\ \\ f(-\frac{4}{5}) = \frac{34}{25}$