Posted by Equihua on Friday, January 4, 2013 at 2:38pm.
Let g be the function give by g(x) = x^4  4x^3 + 6x^2 – 4x + k where k is constant.
A.On what intervals is g increasing? Justify your answer.
B.On what interval is g concave upward? Justify your answer.
C.Find the value of k for which g has 5 as its relative minimum. Justify your answer.

calculus  Steve, Friday, January 4, 2013 at 3:10pm
g = x^4  4x^3 + 6x^2 – 4x + k
g' = 4x^3  12x^2 + 12x  4 = 4(x1)^3
g'' = 12x^2  24x + 12 = 12(x1)^2
g increasing where g' > 0: x>1
g concave up where g'' > 0: all real x
g(x) = (x1)^4 + (k1)
so, if g(1) = 5, k=6