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(yx+xy=2)ddx\left(\frac{y}{x}+xy=-2\right)\frac{d}{dx}

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Q. (yx+xy=2)ddx\left(\frac{y}{x}+xy=-2\right)\frac{d}{dx}
  1. Given Equation Differentiation: We are given the equation (yx)+xy=2(\frac{y}{x}) + xy = -2 and we need to find its derivative with respect to xx. We will use the rules of differentiation to differentiate each term separately.
  2. Quotient Rule Application: Differentiate the first term yx\frac{y}{x} with respect to xx. Since yy is a function of xx, we will use the quotient rule which is d(uv)dx=v(dudx)u(dvdx)v2\frac{d(\frac{u}{v})}{dx} = \frac{v(\frac{du}{dx}) - u(\frac{dv}{dx})}{v^2}. Here, u=yu = y and v=xv = x, so dudx=dydx\frac{du}{dx} = \frac{dy}{dx} and dvdx=1\frac{dv}{dx} = 1.
  3. Product Rule Application: Applying the quotient rule to yx\frac{y}{x}, we get:\newlined(yx)dx=x(dydx)y(1)x2\frac{d(\frac{y}{x})}{dx} = \frac{x(\frac{dy}{dx}) - y(1)}{x^2}\newline=x(dydx)yx2= \frac{x(\frac{dy}{dx}) - y}{x^2}
  4. Combining Derivatives: Differentiate the second term xyxy with respect to xx. Since this is a product of two functions, we will use the product rule which is d(uv)dx=udvdx+vdudx\frac{d(uv)}{dx} = u\frac{dv}{dx} + v\frac{du}{dx}. Here, u=xu = x and v=yv = y, so dudx=1\frac{du}{dx} = 1 and dvdx=dydx\frac{dv}{dx} = \frac{dy}{dx}.
  5. Simplifying Equation: Applying the product rule to xyxy, we get: d(xy)dx=x(dydx)+y(1)\frac{d(xy)}{dx} = x\left(\frac{dy}{dx}\right) + y(1) =x(dydx)+y= x\left(\frac{dy}{dx}\right) + y
  6. Correction of Mistake: Now, we combine the derivatives of both terms and set the derivative of the entire equation equal to the derivative of 2-2, which is 00 since 2-2 is a constant.\newlined(yx)dx+d(xy)dx=d(2)dx\frac{d(\frac{y}{x})}{dx} + \frac{d(xy)}{dx} = \frac{d(-2)}{dx}\newline(x(dydx)yx2)+(x(dydx)+y)=0\left(\frac{x(\frac{dy}{dx}) - y}{x^2}\right) + (x(\frac{dy}{dx}) + y) = 0
  7. Correction of Mistake: Now, we combine the derivatives of both terms and set the derivative of the entire equation equal to the derivative of 2-2, which is 00 since 2-2 is a constant.\newlined(yx)dx+d(xy)dx=d(2)dx\frac{d(\frac{y}{x})}{dx} + \frac{d(xy)}{dx} = \frac{d(-2)}{dx}\newline(xdydxy)x2+(xdydx+y)=0\frac{(x\frac{dy}{dx} - y)}{x^2} + (x\frac{dy}{dx} + y) = 0We simplify the equation by combining like terms. However, we need to be careful with the terms involving dydx\frac{dy}{dx}, as they cannot be simply added or subtracted without considering their coefficients.\newline(xdydxy)x2+(xdydx+y)=0\frac{(x\frac{dy}{dx} - y)}{x^2} + (x\frac{dy}{dx} + y) = 0\newline(xdydxy+x2dydx+x2y)x2=0\frac{(x\frac{dy}{dx} - y + x^2\frac{dy}{dx} + x^2*y)}{x^2} = 0
  8. Correction of Mistake: Now, we combine the derivatives of both terms and set the derivative of the entire equation equal to the derivative of 2-2, which is 00 since 2-2 is a constant.\newlined(yx)dx+d(xy)dx=d(2)dx\frac{d(\frac{y}{x})}{dx} + \frac{d(xy)}{dx} = \frac{d(-2)}{dx}\newline(x(dydx)yx2)+(x(dydx)+y)=0\left(\frac{x(\frac{dy}{dx}) - y}{x^2}\right) + (x(\frac{dy}{dx}) + y) = 0We simplify the equation by combining like terms. However, we need to be careful with the terms involving dydx\frac{dy}{dx}, as they cannot be simply added or subtracted without considering their coefficients.\newline(x(dydx)yx2)+(x(dydx)+y)=0\left(\frac{x(\frac{dy}{dx}) - y}{x^2}\right) + (x(\frac{dy}{dx}) + y) = 0\newlinex(dydx)y+x2(dydx)+x2yx2=0\frac{x(\frac{dy}{dx}) - y + x^2(\frac{dy}{dx}) + x^2\cdot y}{x^2} = 0We made a mistake in the previous step by incorrectly combining the terms. We should have found a common denominator before combining them. Let's correct this.\newlinex(dydx)yx2+x(dydx)+y=0\frac{x(\frac{dy}{dx}) - y}{x^2} + x(\frac{dy}{dx}) + y = 0\newlinex(dydx)y+x3(dydx)+x2yx2=0\frac{x(\frac{dy}{dx}) - y + x^3(\frac{dy}{dx}) + x^2\cdot y}{x^2} = 0

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