Show the function 
is a strictly decreasing function on R.
Domain of the function is R
Finding derivative f’(x)=-2
Which is less than 0
Means strictly decreasing in its domain i.e R
1
Show the function is a strictly decreasing function on R.
Domain of the function is R
Finding derivative f’(x)=-2
Which is less than 0
Means strictly decreasing in its domain i.e R