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Find the values of x for which the following functions are maximum or minimum: (i)x^(3)- 3x^(2) - 9x (ii)4x^(3)-15x^(2)+12x+1 (iii)1-x-x^(2) (iv) x^(4)-8x^(3)+22x^(2)-24x +7 (v) (x^(2)-x+1)/(x^(2)+x+1)

Answer»


Answer :(i) Max at X =-1, MIN at x = 3`"(ii) Max at x = 1/2, min at x = 2`
(III)Max at `x =- 1/2""(iv)"Max at "x = 2,` min at x = 1, 3
(v) Min at x= 1 and maxat x = - 1


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