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f(x)=(x^2-1)/(x-2)
Solution
f(x) = (x^2 - 1)^3 f ' (x) = 3(x^2 - 1)^2 * 2x = 6x(x^2 - 1)^2 f " (x) = 6(x^2 - 1)^2 + 12x(x^2 -
1)*2x = 6(x^2 - 1)^2 + 24x(x^2 - 1) f ' = 0 when x = 0 , 1 , or -1 a) f is increasing when f ' (x) >
0 using a sign chart, f ' > 0 on the intervals: (0 , 1) U (1 , inf) at x = 1, f ' is 0 b) there is only one
relative min-- at x = 0 --, and no relative maxes the zeros of f ' at -1 and 1 are horizontal
tangents, but not min or max c) the graph is concave up when f " > 0 f " (x) = 6(x^2 - 1)^2 +
12x(x^2 - 1)*2x = 6(x^2 - 1)^2 + 24x(x^2 - 1) f " (x) = (x^2 - 1)[6(x^2 - 1) + 24x] f " (x) = (x -
1)(x + 1)(6x^2 + 24x - 6) f " (x) = 6(x - 1)(x + 1)(x^2 + 4x - 1) points of inflection at x = 1, -1 ,
[-4 +/- sqrt(20)] / 2 points of inflection: x = -1 , -2 - sqrt(5) , -2 + sqrt(5) , 1 concave up on
intervals (using sign charts): (-inf , -1) U (-2 - sqrt(5) , -2 + sqrt(5)) U (1 , inf)

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f(x)-(x^2-1)-(x-2)Solution f(x) - (x^2 - 1)^3 f -'.docx

  • 1. f(x)=(x^2-1)/(x-2) Solution f(x) = (x^2 - 1)^3 f ' (x) = 3(x^2 - 1)^2 * 2x = 6x(x^2 - 1)^2 f " (x) = 6(x^2 - 1)^2 + 12x(x^2 - 1)*2x = 6(x^2 - 1)^2 + 24x(x^2 - 1) f ' = 0 when x = 0 , 1 , or -1 a) f is increasing when f ' (x) > 0 using a sign chart, f ' > 0 on the intervals: (0 , 1) U (1 , inf) at x = 1, f ' is 0 b) there is only one relative min-- at x = 0 --, and no relative maxes the zeros of f ' at -1 and 1 are horizontal tangents, but not min or max c) the graph is concave up when f " > 0 f " (x) = 6(x^2 - 1)^2 + 12x(x^2 - 1)*2x = 6(x^2 - 1)^2 + 24x(x^2 - 1) f " (x) = (x^2 - 1)[6(x^2 - 1) + 24x] f " (x) = (x - 1)(x + 1)(6x^2 + 24x - 6) f " (x) = 6(x - 1)(x + 1)(x^2 + 4x - 1) points of inflection at x = 1, -1 , [-4 +/- sqrt(20)] / 2 points of inflection: x = -1 , -2 - sqrt(5) , -2 + sqrt(5) , 1 concave up on intervals (using sign charts): (-inf , -1) U (-2 - sqrt(5) , -2 + sqrt(5)) U (1 , inf)