Find all relative extrema Use the Second Derivative Test whe

Find all relative extrema. Use the Second Derivative Test where applicable. (If an answer does not exist, enter DNE.)
f (x) = x + (49/x)
relative minimum=
relative maximum=

f\'(x) = 1-49/x^2 = 0 we get x = + 7 , -7 f\'\'(x) = 49*2/x^3 = 98/x^3 relative maximum = 14 Relative minimum = -14