Q. Using implicit differentiation, find dxdy.−7x2y4−5xy2=4−4x
Apply Implicit Differentiation: To find the derivative dxdy using implicit differentiation, we need to differentiate both sides of the equation with respect to x, treating y as a function of x. This means we will apply the product rule to terms involving both x and y, and the chain rule to terms involving y.
Differentiate −7x2y4: Differentiate the term −7x2y4 with respect to x. Using the product rule, we get the derivative of the first function times the second function plus the first function times the derivative of the second function. The derivative of x2 is 2x, and the derivative of y4 with respect to x is 4y3(dxdy) by the chain rule.So, the derivative of −7x2y4 is −7[2xy4+x2⋅4y3(dxdy)].
Differentiate −5xy2: Differentiate the term −5xy2 with respect to x. Again, using the product rule, we get the derivative of the first function times the second function plus the first function times the derivative of the second function. The derivative of x is 1, and the derivative of y2 with respect to x is 2ydxdy by the chain rule.So, the derivative of −5xy2 is −5[y2+x⋅2ydxdy].
Differentiate 4−4x: Differentiate the right side of the equation, 4−4x, with respect to x. The derivative of a constant is 0, and the derivative of −4x with respect to x is −4.So, the derivative of 4−4x is 0−4.
Combine and Simplify: Combine the derivatives from the previous steps to write the differentiated equation:−7[2xy4+x2⋅4y3(dxdy)]−5[y2+x⋅2y(dxdy)]=−4.
Isolate Terms: Simplify the equation by distributing the constants and combining like terms: −14xy4−28x2y3dxdy−5y2−10xydxdy=−4.
Factor Out (dxdy): Isolate terms with (dxdy) on one side and the rest on the other side:\(-28x^{2}y^{3}(\frac{dy}{dx}) - 10xy(\frac{dy}{dx}) = 4 + 14xy^{4} + 5y^{2}.
Solve for dxdy: Factor out dxdy from the left side of the equation:dxdy(−28x2y3−10xy)=4+14xy4+5y2.
Solve for (dxdy):</b>Factorout$(dxdy) from the left side of the equation:(dxdy)(−28x2y3−10xy)=4+14xy4+5y2.Solve for (dxdy) by dividing both sides of the equation by (−28x2y3−10xy):(dxdy)=−28x2y3−10xy4+14xy4+5y2.
More problems from Simplify expressions using trigonometric identities