R:f(x)=x-1
a)f(1+√2)-f(1-√2)=1+√2-1-1+√2+1=2√2
b)A(-2,a) B(3,b) aparțin dreptei
a=-2-1=-3 b=3-1=2
=>A(-2,-3) B(3,2)
AB=√(-2-3)²+(-3-2)²=√5²+5²=5√2
