7. Derivar: \( y=\frac{3}{x^{3}}+3 x^{2}-2 x-8 \) 8
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Um, let’s get our calculus hats on! The derivative of the function \( y = \frac{3}{x^{3}} + 3x^{2} - 2x - 8 \) involves applying the power rule and the quotient rule. The derivative will be: \[ y' = -\frac{9}{x^{4}} + 6x - 2 \] So, your final expression for \( y' \) is \( -\frac{9}{x^{4}} + 6x - 2 \). Easy peasy, right? Don't forget to check each term carefully! A common mistake is misapplying the power rule to the fraction or forgetting to differentiate constant terms, which drop out to zero (bye-bye, -8!). Keep practicing, and those derivatives will feel like second nature!