Q. For the following equation, evaluate dxdy when x=−1.y=2x5+2x3Answer:
Apply Power Rule: To find the derivative of y with respect to x, we need to apply the power rule of differentiation, which states that the derivative of xn with respect to x is n⋅x(n−1).
Differentiate 2x5: Differentiate the first term 2x5 using the power rule: The derivative is 5×2x5−1=10x4.
Differentiate 2x3: Differentiate the second term 2x3 using the power rule: The derivative is 3×2x3−1=6x2.
Combine Derivatives: Combine the derivatives of both terms to get the overall derivative dxdy: dxdy=10x4+6x2.
Substitute x=−1: Now, substitute x=−1 into the derivative to evaluate dxdy at x=−1: dxdy=10(−1)4+6(−1)2.
Calculate Powers: Calculate the powers of −1: (−1)4=1 and (−1)2=1.
Substitute Values: Substitute the values back into the expression: (dxdy)=10(1)+6(1)=10+6.
Find Final Value: Add the numbers to find the value of (dy)/(dx) when x=−1: (dy)/(dx)=10+6=16.
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