** Final answer to the problem

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** Step-by-step Solution **

** How should I solve this problem?

- Choose an option
- Find the derivative using the definition
- Find the derivative using the product rule
- Find the derivative using the quotient rule
- Find the derivative using logarithmic differentiation
- Find the derivative
- Integrate by partial fractions
- Product of Binomials with Common Term
- FOIL Method
- Integrate by substitution
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The derivative of a sum of two or more functions is the sum of the derivatives of each function

Learn how to solve integral calculus problems step by step online.

$\frac{d}{dx}\left(-21x^2\right)+\frac{d}{dx}\left(4x\right)$

Learn how to solve integral calculus problems step by step online. Find the derivative d/dx(-21x^2+4x+3) using the sum rule. The derivative of a sum of two or more functions is the sum of the derivatives of each function. The derivative of the linear function times a constant, is equal to the constant. The derivative of the linear function is equal to 1. The derivative of a function multiplied by a constant is equal to the constant times the derivative of the function.

** Final answer to the problem

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