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# For the Curve Y = 5x – 2x3, If X Increases at the Rate of 2 Units/Sec, Then Find the Rate of Change of the Slope of the Curve When X = 3 - CBSE (Science) Class 12 - Mathematics

ConceptProcedure to Form a Differential Equation that Will Represent a Given Family of Curves

#### Question

For the curve y = 5x – 2x3, if x increases at the rate of 2 units/sec, then find the rate of change of the slope of the curve when x = 3

#### Solution

The given curve is y = 5x – 2x3 and dx/dt = 2 units/sec

y = 5x – 2x3

Differentiating both sides w.r.t x, we get

Slope of the curve = dy/dx = 5 - 6x^2

Differentiating both sides w.r.t t, we get

=> d/dt (dy/dx) = 0 - 12x dx/dt

=> d/dt (dy/dx)_(x = 3) = 0 - 12 xx 3 xx2 = -72 "units/sec"

Thus, the slope of the curve is decreasing at the rate of 72 units/sec when x = 3

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#### APPEARS IN

Solution For the Curve Y = 5x – 2x3, If X Increases at the Rate of 2 Units/Sec, Then Find the Rate of Change of the Slope of the Curve When X = 3 Concept: Procedure to Form a Differential Equation that Will Represent a Given Family of Curves.
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