Question

dada a funcao f(x)=-5x+2, calcula:
A) f(-3)
B) f(5)
C) f(-2/5)
D) f(1/3)
E) x, para que f(x)=0
D) x, para que f(x)=-18

Answer 1

f(x)=-5x+2
f(-3)=-5*(-3)+2=17
f(5)=-5*5+2=-23
f(-2/5)=-5*(-2/5)+2=4
f(1/3)=-5*(1/3)+2=0,33
f(x)=-5x+2=0; -5x=-2; x=-2/-5; x=0,4
f(x)=-5x+2=18; -5x=18-2; x=16/-5=-3,2