Matematică >> funcţii derivabile >> 1
1. Derivata funcției \( f : D \rightarrow \mathbb{R} \), \( f(x) = 5x^4 -7x^2 -8x +9 \).
\( f(x) = 5x^4 -7x^2 -8x +9 \)
\( f(x) = 5x^{\color{red}4} -7x^{\color{red}2} -8x^{\color{blue}1} +\color{darkmagenta}9 \)
\( f'(x) = 5 \cdot \color{red}4 \color{dimgray} x^{\color{red}4-1} -7 \cdot \color{red}2 \color{dimgray} x^{\color{red}2-1} -8x^{\color{blue}1-1} +\color{darkmagenta}0 \)
\( f'(x) = 20x^3 -14x -8 \).
Derivata funcţiei \( f : D \rightarrow \mathbb{R} \),
\(f(x)=-6x^{8}-3x^{7}+7x^{3}-5x-2\)
este:
exercițiu nou
Derivata funcţiei \( f : D \rightarrow \mathbb{R} \),
\(f(x)=-6x^{8}-3x^{7}+7x^{3}-5x-2\)
este:
\(f'(x)=\)\(-48x^{7}-21x^{6}+21x^{2}-5\).
Avem:
\(f(x) = -6x^{8}-3x^{7}+7x^{3}-5x-2\)
\(f(x) = -6x^{ \color{red}8 \color{dimgray}}-3x^{ \color{red}7 \color{dimgray}}+7x^{ \color{red}3 \color{dimgray}}-5x^{ \color{blue}1 \color{dimgray}} \color{darkmagenta}-2 \color{dimgray}\)
\(f'(x) = -6\cdot \color{red}8 \color{dimgray}x^{ \color{red}8-1 \color{dimgray}}-3\cdot \color{red}7 \color{dimgray}x^{ \color{red}7-1 \color{dimgray}}+7\cdot \color{red}3 \color{dimgray}x^{ \color{red}3-1 \color{dimgray}}-5x^{ \color{blue}1-1 \color{dimgray}} \color{darkmagenta}-0 \color{dimgray}\)
\(f'(x) = \)\(-48x^{7}-21x^{6}+21x^{2}-5\).