1. u=x-4 , u'=1 , v=(x+2)2, v'=2(x+2)
hence dy/dx = (x+2)2+(x-4).2(x+2)
=(x+2)[(x+2)+2x-8]
=(x+2)(3x-6)
=3(x+2)(x-2)
now for stat. points dy/dx = 0
so x=2, -2
test for their nature
2. exactly the same.
3. This involves the quotient rule
ie. d/dx(u/v)= (vu'-uv')/v2
so if y = x2/(x-2)...