CalculusHard ShareCalculus · Hard problemDifferentiate f(x)=7x3−4x+2f(x)=7x^3-4x+2f(x)=7x3−4x+2.A21x2−421x^2-421x2−4B21x2+421x^2+421x2+4C21x3−421x^{3}-421x3−4D21x2−521x^2-521x2−5Check Show answer Walk through it step by step Practice more like this