Question

The function $f(x)=x^2-2x$ is strictly decreasing in the interval

• A. $(-\infty ,1)$
• B. $(1,\infty )$
• C. $R$
• D. $(-\infty ,\infty )$

Answer 1

Answer: (A)

$f^{\prime }(x)<0;2(x-1)<0$
$x<1;x\in (-\infty ,1)$