Q. - Let g be a function such that g(−1)=5 and g′(−1)=6.- Let h be the function h(x)=2x2.Evaluate dxd[h(x)g(x)] at x=−1.
Apply Quotient Rule: First, we need to apply the quotient rule for differentiation, which is given by:(dxd)[v(x)u(x)]=(v(x))2v(x)⋅u′(x)−u(x)⋅v′(x)Here, u(x)=g(x) and v(x)=h(x).
Find Derivatives: We need to find the derivatives of g(x) and h(x). We are given g′(−1)=6, so we already have the derivative of g(x) at x=−1. For h(x), we need to differentiate h(x)=2x2.The derivative of h(x) with respect to x is h′(x)=dxd[2x2]=4x.
Evaluate Derivatives: Now we evaluate h′(x) at x=−1 to get h′(−1). h′(−1)=4∗(−1)=−4.
Apply Quotient Rule: Next, we need to evaluate g(x) and h(x) at x=−1. We are given g(−1)=5, and we can calculate h(−1)=2∗(−1)2=2∗1=2.
Substitute Values: Now we have all the values we need to apply the quotient rule:g′(−1)=6, g(−1)=5, h′(−1)=−4, and h(−1)=2.Using the quotient rule:(d/dx)[g(x)/h(x)] at x=−1 = (h(−1)⋅g′(−1)−g(−1)⋅h′(−1))/(h(−1))2
Perform Calculations: Substitute the known values into the quotient rule formula: (dxd)[h(x)g(x)] at x=−1 = (2)2(2×6−5×−4)
Perform Calculations: Substitute the known values into the quotient rule formula:(d/dx)[g(x)/h(x)] at x=−1 = (2×6−5×−4)/(2)2Now, perform the calculations:(d/dx)[g(x)/h(x)] at x=−1 = (12+20)/4(d/dx)[g(x)/h(x)] at x=−1 = 32/4(d/dx)[g(x)/h(x)] at x=−1 = x=−11
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