Q. Given the function y=(3+4x)(6x−5−x3), find dxdy in any form.Answer: dxdy=
Given Function: We are given the function y=(3+4x)(6x−5−x3). To find the derivative dxdy, we will use the product rule, which states that the derivative of a product of two functions is the derivative of the first function times the second function plus the first function times the derivative of the second function.
Product Rule: Let's denote the first function as f(x)=3+4x and the second function as g(x)=6x−5−x3. According to the product rule, dxdy=f′(x)g(x)+f(x)g′(x).
Derivative of f(x): First, we find the derivative of f(x), which is f′(x)=dxd(3+4x). The derivative of a constant is 0, and the derivative of 4x with respect to x is 4. Therefore, f′(x)=0+4=4.
Derivative of g(x): Next, we find the derivative of g(x), which is g′(x)=dxd(6x−5−x3). The derivative of 6x is 6, the derivative of −5 is 0, and the derivative of −x3 is −3x2. Therefore, g′(x)=6−0−3x2=6−3x2.
Apply Product Rule: Now we apply the product rule: (dxdy)=f′(x)g(x)+f(x)g′(x). Substituting the derivatives we found, we get (dxdy)=4(6x−5−x3)+(3+4x)(6−3x2).
Simplify Expression: We simplify the expression by distributing the multiplication: (dxdy)=4×6x−4×5−4×x3+3×6+3×(−3x2)+4x×6−4x×3x2.
Further Simplify: Further simplifying, we get dxdy=24x−20−4x3+18−9x2+24x−12x3.
Combine Like Terms: Combine like terms to get the final derivative: (dy)/(dx)=(24x+24x)−20+18−(4x3+12x3)−9x2.
Final Derivative: After combining like terms, we have (dxdy)=48x−2−16x3−9x2.
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