Q. If 2xy−2y=−3x3 then find dxdy in terms of x and y.Answer: dxdy=
Given Equation: We are given the equation 2xy−2y=−3x3, and we need to find the derivative of y with respect to x, which is denoted as dxdy. To do this, we will use implicit differentiation, which involves taking the derivative of both sides of the equation with respect to x, treating y as a function of x.
Implicit Differentiation: First, we differentiate the left side of the equation with respect to x. The left side is 2xy−2y. We apply the product rule to the term 2xy, which states that the derivative of a product uv is u′v+uv′. Here, u=x and v=y, so we get 2(y+xy′). We also differentiate −2y with respect to x, which gives us 2xy−2y0 because 2xy−2y1 is a function of x.
Differentiate Left Side: Now, we differentiate the right side of the equation, which is −3x3. The derivative of −3x3 with respect to x is −9x2.
Differentiate Right Side: We now have the equation from the derivatives of both sides: 2(y+xy′)−2y′=−9x2. We need to solve this equation for y′ to find (dy/dx).
Solve for y′: Let's simplify the equation and collect all terms involving y′ on one side. We distribute the 2 on the left side to get 2y+2xy′−2y′=−9x2. Then we combine like terms to get 2y+(2x−2)y′=−9x2.
Isolate y′: Next, we isolate the term involving y′ by subtracting 2y from both sides: (2x−2)y′=−9x2−2y.
Final Solution: Now, we solve for y′ by dividing both sides by (2x−2): y′=2x−2−9x2−2y.
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