If $m$ and $M$ respectively denote the minimum and maximum values of $f(x)=(x+1)^{2}+3$ in the interval $[-3,1]$, then the ordered pair $(m, M)=$_____________
The given function is $f(x)=(x+1)^{2}+3, x \in[-3,1]$.
$f(x)=(x+1)^{2}+3$
Differentiating both sides with respect to x, we get
$f^{\prime}(x)=2(x+1)$
For maxima or minima,
$f^{\prime}(x)=0$
$f^{\prime}(x)=0$
$\Rightarrow 2(x+1)=0$
$\Rightarrow x+1=0$
$\Rightarrow x=-1$
Now,
$f^{\prime \prime}(x)=2>0$
So, x = −1 is the point of local minimum of f(x).
At x = −1, we have
$f(-1)=(-1+1)^{2}+3=0+3=3$
At x = −3, we have
$f(-3)=(-3+1)^{2}+3=4+3=7$
At x = 1, we have
$f(1)=(1+1)^{2}+3=4+3=7$
Thus, the minimum value of f(x) is 3 and the maximum value of f(x) is 7.
∴ m = 3 and M = 7
Thus, the ordered pair (m, M) is (3, 7).
If m and M respectively denote the minimum and maximum values of f(x) = (x + 1)2 + 3 in the interval [−3, 1], then the ordered pair (m, M) = ___(3, 7)___.