Q. If −5x2−y3+4y2=3 then find dxdy at the point (1,2).Answer: dxdy∣∣(1,2)=
Implicit Differentiation: To find the derivative of y with respect to x, dxdy, we need to implicitly differentiate the given equation with respect to x.
Differentiate Terms: Differentiate each term of the equation with respect to x, remembering to use the chain rule for terms involving y, since y is a function of x. dxd(−5x2)=−10x dxd(−y3)=−3y2⋅dxdy dxd(4y2)=8y⋅dxdy dxd(3)=0
Combine Derivatives: Combine the derivatives to form the differentiated equation: −10x−3y2⋅dxdy+8y⋅dxdy=0
Isolate dxdy: Now, solve for dxdy by isolating terms that contain dxdy on one side of the equation:\(-3y^2 \cdot \frac{dy}{dx} + 8y \cdot \frac{dy}{dx} = 10x
Factor Out (dxdy):</b>Factorout$(dxdy) from the terms on the left side of the equation:(\frac{dy}{dx}) \cdot (\(-3y^2 + 8y) = 10x
Solve for (dxdy): Divide both sides of the equation by (−3y2+8y) to solve for (dxdy):dxdy=−3y2+8y10x
Substitute Values: Substitute x=1 and y=2 into the equation to find the value of (dxdy) at the point (1,2):(dxdy)∣(1,2)=(−3(2)2+8(2))10(1)
Calculate dxdy: Calculate the value of dxdy at the point (1,2): dxdy∣∣(1,2)=−3(4)+1610 dxdy∣∣(1,2)=−12+1610 dxdy∣∣(1,2)=410 dxdy∣∣(1,2)=2.5
More problems from Transformations of quadratic functions