For x 2 8x f ( x ) = - x2 + 4 f' (x ) = ( x 2 + 4) 2 . Find the x component of the critical point. (Please use exact values which might include square roots or exponentials etc. No decimals) X The interval of decrease is The interval of increase is( The critical point is a (You have one attempt for this part) O local minimum K O local maximum O neither