Question

помогите, , пожалуйста))))

Answer 1

$sqrt{(k-1)^2}=1-k\ k^2-2k+1=(1-k)^2\ k leq 1$

$sqrt{(1+k)^2}=-1-k\ (1+k)^2=(-1-k)^2\ verno\ k leq -1$

Answer 2

$sqrt{(k-1)^2} =|k-1| \ |k-1|=1-k, k-1<0 \ |k-1|=1-k, k<1 \\ sqrt{(1+k)^2} =|1+k| \ |1+k|=-1-k, 1+k<0 \ |1+k|=-1-k, k<-1$