Q. Given the function y=(−10x3+5)(−4+10x2+x3), find dxdy in any form.Answer: dxdy=
Define Functions: To find the derivative of the function y=(−10x3+5)(−4+10x2+x3), we will use the product rule. The product rule 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.Let's denote the first function as f(x)=−10x3+5 and the second function as g(x)=−4+10x2+x3.
Find f′(x): First, we find the derivative of f(x) with respect to x. The derivative of −10x3 is −30x2, and the derivative of a constant, 5, is 0. So, f′(x)=−30x2.
Find g′(x): Next, we find the derivative of g(x) with respect to x. The derivative of −4 is 0, the derivative of 10x2 is 20x, and the derivative of x3 is 3x2. So, g′(x)=20x+3x2.
Apply Product Rule: Now, we apply the product rule. The derivative of y with respect to x, denoted as dxdy, is given by:dxdy=f′(x)g(x)+f(x)g′(x).Substituting the derivatives we found, we get:dxdy=(−30x2)(−4+10x2+x3)+(−10x3+5)(20x+3x2).
Expand Terms: We now expand the terms in the expression for (dy)/(dx):(dy)/(dx)=(−30x2)(−4)+(−30x2)(10x2)+(−30x2)(x3)+(−10x3)(20x)+(−10x3)(3x2)+(5)(20x)+(5)(3x2).
Simplify Expression: Simplify the expression by multiplying the terms: (dy)/(dx)=120x2−300x4−30x5−200x4−30x5+100x+15x2.
Combine Like Terms: Combine like terms in the expression:(dy)/(dx)=100x+(120x2+15x2)−(300x4+200x4)−(30x5+30x5).(dy)/(dx)=100x+135x2−500x4−60x5.
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