The function is $\"y=3-$ and the interval is $\"[$ .

$\"y=3-$

Apply derivative on each side with respect to $\"t\"$ .

$\"\\frac{d\\$

$\"\\small$

To find the critical numbers of $\"y\"$ , equate $\"y\'\"$ to zero.

$\"\\\\y\'=0\\\\$

The function $\"y\"$ has critical value at $\"t=3\"$ .

$\"t=3\"$ is in the region $\"[$ .

$\"\\\\y=3-$

To find the absolute extreme of function in given region $\"[$ , sketch the function .

$\"\"$

Critical point $\"(3,\\$ is maximum point over the interval $\"[$ .

Left end point $\"(-1,\\$ is minimum point over the interval $\"[$ .

$\"\"$

Minimum point is $\"(-1,\\$ .

Maximum point is $\"(3,\\$ .