The volume of a spherical balloon with radius r inches is equal to V(r)=43πr3. Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to radius of r+1 inches.
The amount of air required to inflate the balloon is equal to the volume of the sphere with new radius minus the volume of the balloon with the original radius.
VTotal=V(r+1)−V(r)VTotal=43π(r+1)3−43πr3(Expanding the cubic function)VTotal=43π[\cancelr3+3r2+3r+1−\cancelr3](Simplifying the equation and combining like terms)
VTotal=43π[3r2+3r+1]
Monday, December 8, 2014
Single Variable Calculus, Chapter 1, 1.1, Section 1.1, Problem 22
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