Suppose y= √2x + 1 where x and y are functions of t.
(a) if dx/dt= 12, find dy/dt when x=4.
(b) if dy/dt= 3, find dx/dt when x=4012.
Solution:
y = √2x + 1 [Given]
Differentiating both sides with respect to t
dy/dt = dx/dt/ √(2x + 1)
(a) if dx/dt= 12, we have to find dy/dt when x=4
dy/dt = 12/√(2(4) + 1)
dy/dt = 12/√(9)
dy/dt = 12/√9
dy/dt = 12/3
dy/dt = 4
(b) if dy/dt= 3, we have to find dx/dt when x=4012.
3 = dx/dt/ √(2(4012) + 1)
3 × √(8024 + 1) = dx/dt
dx/dt = 3 × √8025
dx/dt = 3 × 5√321
dx/dt = 15 √321
Therefore, the values of dy/dt is 4 and dx/dt is 15√321.
Suppose y= where x and y are functions of t.
(a) if dx/dt= 12, find dy/dt when x=4.
(b) if dy/dt= 3, find dx/dt when x=4012.
Summary:
Suppose √2x + 1 where x and y are functions of t.
(a) if dx/dt= 12, dy/dt is 4 when x = 4.
(b) if dy/dt= 3, dx/dt is 15√321 when x = 4012.
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