Q. Given the function y=(−6−10x−1−x)(−7−7x3), find dxdy in any form.
Identify functions: We are given the function y=(−6−10x−1−x)(−7−7x3). To find the derivative of this function with respect to x, 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.
Derivative of u: First, let's identify the two functions that are being multiplied. We have u=−6−10x−1−x and v=−7−7x3. We will need to find the derivatives of both u and v with respect to x.
Derivative of v: The derivative of u with respect to x is given by:dxdu=dxd(−6)+dxd(−10x−1)+dxd(−x)The derivative of a constant is 0, so dxd(−6)=0.The derivative of −10x−1 is 10x−2 because dxd(xn)=nxn−1.The derivative of −x is −1 because x0.So, x1.
Apply product rule: Now, let's find the derivative of v with respect to x:dxdv=dxd(−7)+dxd(−7x3)Again, the derivative of a constant is 0, so dxd(−7)=0. The derivative of −7x3 is −21x2 because dxd(xn)=nxn−1. So, dxdv=0−21x2.
Distribute terms: Now we can apply the product rule:(dxdy)=(dxdu)⋅v+u⋅(dxdv)Substituting the derivatives we found:(dxdy)=(10x−2−1)⋅(−7−7x3)+(−6−10x−1−x)⋅(−21x2)
Combine like terms: Let's distribute the terms:dxdy=−70x−2+7+70x+7x4−126x−210−21x3
Combine like terms: Let's distribute the terms:(dy)/(dx)=−70x−2+7+70x+7x4−126x−210−21x3Now we combine like terms:(dy)/(dx)=7x4−21x3−56x−203+7x−2
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