Q. Given the function y=2(−7x2−2x)6, find dxdy in any form.Answer: dxdy=
Identify Function: We are given the function y=2(−7x2−2x)6 and we need to find its derivative with respect to x, which is denoted as dxdy. To do this, we will use the chain rule, which states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. The outer function in this case is u6 and the inner function is u=2(−7x2−2x). Let's start by finding the derivative of the outer function with respect to its inner function u.
Derivative of Outer Function: The derivative of u6 with respect to u is 6u5. Now we will apply this to our function by substituting u with 2(−7x2−2x), which gives us 6[2(−7x2−2x)]5.
Derivative of Inner Function: Next, we need to find the derivative of the inner function u=2(−7x2−2x) with respect to x. The derivative of −7x2 with respect to x is −14x, and the derivative of −2x with respect to x is −2. Therefore, the derivative of the inner function with respect to x is 2(−14x−2).
Multiply Derivatives: Now we multiply the derivative of the outer function by the derivative of the inner function to get the overall derivative. This gives us (dy)/(dx)=6[2(−7x2−2x)]5×2(−14x−2).
Simplify Expression: We can simplify this expression by multiplying the constants outside the brackets. This gives us (dxdy=12×6(−7x2−2x)5×(−14x−2)).
Final Derivative: Finally, we multiply the constants 12 and 6 to get 72. So the derivative of the function y with respect to x is dxdy=72(−7x2−2x)5⋅(−14x−2).
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