**Given f(x) = $$(7x^{4} – 5x^{3})$$, evaluate \[\frac{d f(x)}{d x}\]**

a) $$7x^{4}-5x^{3}$$

b) $$2x^{3}-15x^{2}$$

c) $$28x^{2}-15x^{2}$$

**d) $$28x^{3}-15x^{2}$$ **

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