Q. If −y+5x2+y3−5=0 then find dxdy in terms of x and y.Answer: dxdy=
Differentiate −y: We are given the equation −y+5x2+y3−5=0. To find dxdy, we need to differentiate both sides of the equation with respect to x, treating y as a function of x (implicit differentiation).
Differentiate 5x2: Differentiate −y with respect to x. Since y is a function of x, we use the chain rule and get −dxdy.
Differentiate y3: Differentiate 5x2 with respect to x. The derivative of 5x2 with respect to x is 10x.
Differentiate −5: Differentiate y3 with respect to x. Again, using the chain rule, the derivative is 3y2⋅dxdy.
Combine differentiated terms: Differentiate −5 with respect to x. The derivative of a constant is 0.
Solve for dxdy: Combine all the differentiated terms to rewrite the equation: −dxdy+10x+3y2⋅dxdy−0=0.
Factor out dxdy: Now, we need to solve for dxdy. Group all the terms containing dxdy on one side and the rest on the other side: dxdy(−1+3y2)=−10x.
Isolate dxdy: Factor out dxdy from the left side: dxdy×(−1+3y2)=−10x.
Simplify dxdy: Divide both sides by (−1+3y2) to isolate dxdy: dxdy=(−1+3y2)−10x.
Simplify dxdy: Divide both sides by (−1+3y2) to isolate dxdy: dxdy=(−1+3y2)−10x.Simplify the expression for dxdy: dxdy=(1−3y2)10x.