Asked by Basumitra

If f(x)=x^3-20 then how it happens that f'(x)=3x^2

Answers

Answered by drwls
Because that is the rule for polynomial derivatives. Add up the derivatives of each term. The derivative of a constant term (like -20 in your case) is zero. The derivative of a*x^n is n*a*x^(n-1)
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