jika suatu fungsi f(x) = 2x - 7 ,maka nilai f(1) + f(5) itu apa?

f(1)= 2(1)-7= -5
f(5)= 2(5)-7= 3
f(1)+f(5)= -5+3 = -2

f(x) = 2x -7
f(1) = 2(1) -7 = -5
f(5)= 2(5) -7 = 3
jadi F(1) + f(5) = -5 + 3 = -2