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Let 
x^(4)+y^(2)=17.
What is the value of 
(d^(2)y)/(dx^(2)) at the point 
(-2,1) ?
Give an exact number.

Let x4+y2=17 x^{4}+y^{2}=17 .\newlineWhat is the value of d2ydx2 \frac{d^{2} y}{d x^{2}} at the point (2,1) (-2,1) ?\newlineGive an exact number.

Full solution

Q. Let x4+y2=17 x^{4}+y^{2}=17 .\newlineWhat is the value of d2ydx2 \frac{d^{2} y}{d x^{2}} at the point (2,1) (-2,1) ?\newlineGive an exact number.
  1. Differentiate Equation: Differentiate both sides of the equation x4+y2=17x^{4} + y^{2} = 17 with respect to xx.\newlineUsing the power rule for differentiation, the derivative of x4x^{4} with respect to xx is 4x34x^{3}, and the derivative of y2y^{2} with respect to xx is 2y(dydx)2y(\frac{dy}{dx}) since yy is a function of xx. The derivative of a constant is xx00.\newlineSo, the differentiation gives us xx11.
  2. Solve for dydx\frac{dy}{dx}: Solve for dydx\frac{dy}{dx}. From the previous step, we have 4x3+2ydydx=04x^{3} + 2y\frac{dy}{dx} = 0. Rearrange the equation to solve for dydx\frac{dy}{dx}: 2ydydx=4x32y\frac{dy}{dx} = -4x^{3}. Now, divide both sides by 2y2y to isolate dydx\frac{dy}{dx}: dydx=4x32y\frac{dy}{dx} = \frac{-4x^{3}}{2y}. Simplify the equation: dydx=2x3y\frac{dy}{dx} = \frac{-2x^{3}}{y}.
  3. Differentiate dydx\frac{dy}{dx}: Differentiate both sides of the equation dydx=2x3y\frac{dy}{dx} = -\frac{2x^{3}}{y} again with respect to xx to find d2ydx2\frac{d^{2}y}{dx^{2}}. Using the quotient rule for differentiation, which is v(u)u(v)v2\frac{v(u') - u(v')}{v^{2}}, where u=2x3u = -2x^{3} and v=yv = y, we get: d2ydx2=y(6x2)(2x3)(dydx)y2\frac{d^{2}y}{dx^{2}} = \frac{y(-6x^{2}) - (-2x^{3})(\frac{dy}{dx})}{y^{2}}.
  4. Substitute dydx\frac{dy}{dx}: Substitute the value of dydx\frac{dy}{dx} from Step 22 into the equation from Step 33.\newlineWe have d2ydx2=y(6x2)(2x3)(2x3/y)y2\frac{d^2y}{dx^2} = \frac{y(-6x^2) - (-2x^3)(-2x^3 / y)}{y^2}.\newlineSimplify the equation: d2ydx2=6x2y+(4x6/y)y2\frac{d^2y}{dx^2} = \frac{-6x^2y + (4x^6 / y)}{y^2}.
  5. Substitute Point: Substitute the point (2,1)(-2,1) into the equation from Step 44.\newlineWe have d2y/dx2=[6(2)2(1)+(4(2)6/1)]/12d^{2}y/dx^{2} = [-6(-2)^{2}(1) + (4(-2)^{6} / 1)] / 1^{2}.\newlineCalculate the values: d2y/dx2=[6(4)(1)+(4(64)/1)]/1d^{2}y/dx^{2} = [-6(4)(1) + (4(64) / 1)] / 1.\newlineSimplify the equation: d2y/dx2=[24+256]/1d^{2}y/dx^{2} = [-24 + 256] / 1.
  6. Calculate Final Value: Calculate the final value of d2y/dx2d^{2}y/dx^{2} at the point (2,1)(-2,1). We have d2y/dx2=24+256d^{2}y/dx^{2} = -24 + 256. Simplify the equation: d2y/dx2=232d^{2}y/dx^{2} = 232.

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