# Is #f(x)=(x-3)(x+15)(x+2)# increasing or decreasing at #x=-1#?

##### 1 Answer

Jun 23, 2016

#### Explanation:

For a fun.

For a fun.

Hence,

So,

**An easy way** to find

By this Rule,

Jun 23, 2016

For a fun.

For a fun.

Hence,

So,

**An easy way** to find

By this Rule,