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

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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)
16 years ago

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