Question

The function f(x) = x + 5x^4 has a local minimum at x=?
please give answer with steps​

Answer 1

Step-by-step explanation:

f(x) = x + 5x^4

if we plug in x in f'(x) it gives 0(derivative) f'(x) =0

f'(x) =20x³+1=0

x³=-1/20

x=-(1/2^⅔*5^1/3)