Power Rule for Differentiation

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Let $f$ be the function defined by $f(x) = 2x^5 - 3x^3 + x^2 - 4x + 9$ . What is $f'(x)$ ?

$f'(x)=10*x^4-9*x^2+2*x-4$

$f'(x)=10*x^4-9*x^2+2*x+9$

$f'(x)=10*x^4-9*x^2+ x-4$

$f'(x)=2*x^5-3*x^3+2*x-4$

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