If the function $f(x)=x^2+k x+7$ is strictly increasing in the interval [-2, 2], then
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → K > 4
$y=x^2+k x+7$
$y'=2x+k>0$
$⇒k>-2x$
so $x_{min}=-2$
$k>4$ to be increasing
If the function $f(x)=x^2+k x+7$ is strictly increasing in the interval [-2, 2], then
Correct answer: option 2
The correct answer is Option (2) → K > 4
$y=x^2+k x+7$
$y'=2x+k>0$
$⇒k>-2x$
so $x_{min}=-2$
$k>4$ to be increasing