anonymous
  • anonymous
please help to find cubic equation of f' (x) =0 at(-1;-3,5) f'(x)<0 for x<-1 and x>2 f'(x)>0 for -1
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
You mean f' (the derivative of f is cubic) and want to evaluate f' at -1,-3 and 5?
anonymous
  • anonymous
If so, then take the genral biquad i.e. f(x)=ax^4+bx^3+cx^2+dx+e. Use f(0)=0,f(-2)=0,f(4)=0 and get e=0 and 2 equations with 4 unknowns. Find derivative of f and use the inequalities given.

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