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Given the function 
y=(3+4x)(6x-5-x^(3)), find 
(dy)/(dx) in any form.
Answer: 
(dy)/(dx)=

Given the function y=(3+4x)(6x5x3) y=(3+4 x)\left(6 x-5-x^{3}\right) , find dydx \frac{d y}{d x} in any form.\newlineAnswer: dydx= \frac{d y}{d x}=

Full solution

Q. Given the function y=(3+4x)(6x5x3) y=(3+4 x)\left(6 x-5-x^{3}\right) , find dydx \frac{d y}{d x} in any form.\newlineAnswer: dydx= \frac{d y}{d x}=
  1. Given Function: We are given the function y=(3+4x)(6x5x3)y=(3+4x)(6x-5-x^{3}). To find the derivative dydx\frac{dy}{dx}, 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.
  2. Product Rule: Let's denote the first function as f(x)=3+4xf(x) = 3+4x and the second function as g(x)=6x5x3g(x) = 6x-5-x^{3}. According to the product rule, dydx=f(x)g(x)+f(x)g(x)\frac{dy}{dx} = f'(x)g(x) + f(x)g'(x).
  3. Derivative of f(x)f(x): First, we find the derivative of f(x)f(x), which is f(x)=ddx(3+4x)f'(x) = \frac{d}{dx}(3+4x). The derivative of a constant is 00, and the derivative of 4x4x with respect to xx is 44. Therefore, f(x)=0+4=4f'(x) = 0+4 = 4.
  4. Derivative of g(x)g(x): Next, we find the derivative of g(x)g(x), which is g(x)=ddx(6x5x3)g'(x) = \frac{d}{dx}(6x-5-x^{3}). The derivative of 6x6x is 66, the derivative of 5-5 is 00, and the derivative of x3-x^{3} is 3x2-3x^{2}. Therefore, g(x)=603x2=63x2g'(x) = 6-0-3x^{2} = 6-3x^{2}.
  5. Apply Product Rule: Now we apply the product rule: (dydx)=f(x)g(x)+f(x)g(x)(\frac{dy}{dx}) = f'(x)g(x) + f(x)g'(x). Substituting the derivatives we found, we get (dydx)=4(6x5x3)+(3+4x)(63x2)(\frac{dy}{dx}) = 4(6x-5-x^{3}) + (3+4x)(6-3x^{2}).
  6. Simplify Expression: We simplify the expression by distributing the multiplication: (dydx)=4×6x4×54×x3+3×6+3×(3x2)+4x×64x×3x2(\frac{dy}{dx}) = 4\times 6x - 4\times 5 - 4\times x^{3} + 3\times 6 + 3\times (-3x^{2}) + 4x\times 6 - 4x\times 3x^{2}.
  7. Further Simplify: Further simplifying, we get dydx=24x204x3+189x2+24x12x3\frac{dy}{dx} = 24x - 20 - 4x^{3} + 18 - 9x^{2} + 24x - 12x^{3}.
  8. Combine Like Terms: Combine like terms to get the final derivative: (dy)/(dx)=(24x+24x)20+18(4x3+12x3)9x2(dy)/(dx) = (24x + 24x) - 20 + 18 - (4x^{3} + 12x^{3}) - 9x^{2}.
  9. Final Derivative: After combining like terms, we have (dydx)=48x216x39x2(\frac{dy}{dx}) = 48x - 2 - 16x^{3} - 9x^{2}.

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