The function $y=(x-9)^2 $ is strictly increasing in the interval (s) :
Answer & explanation
Correct answer: option 2
The correct answer is option (2) → (9, ∞)
$y=(x-9)^2$
$\frac{dy}{dx}=2(x-9)=0⇒x=9$
Using wavy curve method
Y is strictly increasing in (9, ∞)