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Multiple Choice
Find the exact length of the curve defined by for .
A
The length is
B
The length is
C
The length is
D
The length is
Verified step by step guidance
1
Step 1: Recall the formula for the arc length of a curve defined parametrically or explicitly. For a curve defined as x = f(y), the arc length is given by ∫_{a}^{b} sqrt{1 + (dx/dy)^2} dy, where dx/dy is the derivative of x with respect to y.
Step 2: Compute dx/dy for the given function x = (1/3)y(y - 3). Use the product rule to differentiate x with respect to y. The product rule states that if x = u*v, then dx/dy = u'(v) + u(v').
Step 3: Apply the product rule to x = (1/3)y(y - 3). Here, u = (1/3)y and v = (y - 3). Differentiate u and v separately: u' = (1/3) and v' = 1. Substitute these into the product rule to find dx/dy.
Step 4: Simplify dx/dy to obtain the derivative. Substitute dx/dy into the arc length formula ∫_{9}^{16} sqrt{1 + (dx/dy)^2} dy.
Step 5: Simplify the integrand sqrt{1 + (dx/dy)^2} to match one of the given options. Verify which option corresponds to the correct simplification of the integrand and set up the integral for evaluation.