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  • Find the points at which the function f given by f (x) = (x - 2)4 (x + 1)3 has local maxima

13) Find the points at which the function f given byf(x) = (x-2)^4(x+1)^3has  

(i) local maxima (ii) local minima (iii) point of inflexion

Answers (1)

best_answer

Given function is
f(x) = (x-2)^4(x+1)^3
f^{'}(x) = 4(x-2)^3(x+1)^3 + 3(x+1)^2(x-2)^4\\ f^{'}(x)= 0\\ 4(x-2)^3(x+1)^3 + 3(x+1)^2(x-2)^4=0\\ (x-2)^3(x+1)^2(4(x+1) + 3(x-2))\\ x = 2 , x = -1 \ and \ x = \frac{2}{7}
Now, for value x close to \frac{2}{7} and to the left of  \frac{2}{7} ,  f^{'}(x) > 0 ,and for value close to \frac{2}{7} and to the right of \frac{2}{7}  f^{'}(x) < 0
Thus,  point  x = \frac{2}{7} is the point of maxima
Now, for value x close to 2 and to the Right of  2 ,  f^{'}(x) > 0 ,and for value close to 2 and to the left of 2  f^{'}(x) < 0
Thus, point x = 2 is the point of minima
There is no change in the sign when the value of x is -1 
Thus x = -1 is the point of inflexion

Posted by

Gautam harsolia

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