

Suppose y = √(2x + 1), where x and y are functions of t.
a)if dx/dt = 3, find dy/dt when x = 4
b)if dy/dt = 5, find dx/dt when x = 12
Solution:
We will differentiate the given parametric function with respect to t using the chain rule and substitute the given values.
a) Given, y = √(2x + 1) can be written as y = (2x + 1)1/2
Differentiate the function w. r. to t.
dy/ dt = 1/ 2 (2x + 1)-1/2 × 2 dx/ dt + 0
Substitute the values of dx/dt = 15 and x = 4.
dy/ dt = 1/ 2 (2(4) + 1)-1/2 × 2 (3) + 0
dy/ dt = 1/ 2 (9)-1/2 × 6
dy/ dt = 1/ 91/2 × 3
dy/ dt = 1/ 3 × 3
dy/ dt = 1
b) Given, y = √(2x + 1) can be written as y = (2x + 1)1/2
Differentiate the function w. r. to t.
dy/ dt = 1/ 2 (2x + 1)-1/2 × 2 dx/ dt + 0
Substitute the values of dy/dt = 5 and x = 12.
5 = 1/ 2 (2(12) + 1)-1/2 × 2 dx/ dt + 0
5 = (24 + 1)-1/2 dx/ dt
5 = 5-1/2 × dx/ dt
5 = 1/ 5 × dx/ dt
dx/ dt = 25
Suppose y = √(2x + 1), where x and y are functions of t.
a)if dx/dt = 3, find dy/dt when x = 4
b)if dy/dt = 5, find dx/dt when x = 12
Summary:
The value of dy/dx = 5 when dx/dt = 15,and x = 4. Also, dx/ dt = 18 when dy/dt = 2 and x = 40.
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