Question

tendo f(x)= -3^2 + 5x + 1, calcule f(3) + f(1)

Answer 1

$f(x)=- 3^{2} +5x+1\\\\ f(3)=- 3^{2} +5.3+1\to f(3)=9+15+1\to f(3)=25\\ \\ f(1)=- 3^{2} +5.1+1\to f(1)=9+5+1\to f(1)=15$