$\"\"$

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The edge of the cube is $\"\"$ ,then volme of the cube is $\"\"$ .

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The rate of change of edge is $\"\"$ .

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Find the rate of change in volume $\"\"$ .

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Consider the equation $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Power rule of the deivative : $\"\"$ .

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$\"\"$ .

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Substitute $\"\"$ in the above equation.

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$\"\"$ .

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$\"\"$

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(a).

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Find $\"\"$ when the edge $\"\"$ cm.

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Substitute $\"\"$ in the equation $\"\"$ .

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$\"\"$

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$\"\"$ .

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(b)

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Find $\"\"$ when the edge $\"\"$ cm.

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Substitute $\"\"$ in the equation $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ .