Răspuns:
Explicație pas cu pas:
f : R --> R ; f(x) = ax+b ; f(x-1/2) = -2x+4
f(x-1/2) = a(x-1/2) +b = ax-a/2+b = -2x +4 =>
ax = -2x => a = -2
-a/2+b = 4 => -(-2)/2 +b = 4 <=> b+1 = 4 => b = 3
f(x) = -2x+3
f : R --> R ; f(x) = ax+b ; f(-1) =2 ; f(3) = -10
f(-1) = -a+b = 2 I ·(-1) =>
f(3) = 3a+b = -10
{a-b = -2
{3a+b = -10 => 4a = -12 => a = -3
b = a+2 => b = -3+2 => b = -1
f(x) = -3x-1
#copaceibrainly
