Q. If 3xy−1=x3−2y then find dxdy in terms of x and y.Answer: dxdy=
Apply Product Rule: We need to differentiate both sides of the equation with respect to x to find dxdy. Differentiate the left side using the product rule: dxd(uv)=udxdv+vdxdu, where u=3y and v=x. Differentiate the right side with respect to x normally.
Differentiate Left Side: Differentiate the left side: d(3xy)/dx=3(d(xy)/dx)−d(1)/dx. Using the product rule: d(xy)/dx=x(dy/dx)+y(dx/dx). Since dx/dx=1, we have d(xy)/dx=x(dy/dx)+y. So, d(3xy)/dx=3(x(dy/dx)+y).
Differentiate Right Side: Differentiate the right side: dxd(x3−2y)=dxd(x3)−dxd(2y). The derivative of x3 with respect to x is 3x2. The derivative of −2y with respect to x is −2dxdy. So, dxd(x3−2y)=3x2−2dxdy.
Equate Derivatives: Now we equate the derivatives from both sides:3(xdxdy+y)−0=3x2−2dxdy.Simplify the equation:3xdxdy+3y=3x2−2dxdy.
Group Terms: Group all the terms containing dxdy on one side and the rest on the other side:3xdxdy+2dxdy=3x2−3y.Factor out dxdy:dxdy(3x+2)=3x2−3y.
Solve for dxdy: Solve for dxdy:dxdy=3x+23x2−3y.This is the derivative of y with respect to x in terms of x and y.
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