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Ex. 4 Find the equation of the tangent line to 
x=root(3)(t) and 
y=(1)/(2)(t^(2)-2) at the point 
(2,31)

Find the equation of the tangent line to \newlinex=t3x=\sqrt[3]{t} and y=12(t22)y=\frac{1}{2}(t^{2}-2) at the point (2,31)(2,31)

Full solution

Q. Find the equation of the tangent line to \newlinex=t3x=\sqrt[3]{t} and y=12(t22)y=\frac{1}{2}(t^{2}-2) at the point (2,31)(2,31)
  1. Find Derivative: To find the equation of the tangent line, we need to find the derivative of yy with respect to xx. This can be done by finding dydt\frac{dy}{dt} and dxdt\frac{dx}{dt} and then dividing dydt\frac{dy}{dt} by dxdt\frac{dx}{dt} to get dydx\frac{dy}{dx}.
  2. Calculate dxdt\frac{dx}{dt}: First, let's find dxdt\frac{dx}{dt}. Given x=t3x = \sqrt[3]{t}, we differentiate with respect to tt to get dxdt=13t23\frac{dx}{dt} = \frac{1}{3}t^{-\frac{2}{3}}.
  3. Calculate dydt\frac{dy}{dt}: Now, let's find dydt\frac{dy}{dt}. Given y=12(t22)y = \frac{1}{2}(t^2 - 2), we differentiate with respect to tt to get dydt=t\frac{dy}{dt} = t.
  4. Find dydx\frac{dy}{dx}: Next, we find dydx\frac{dy}{dx} by dividing dydt\frac{dy}{dt} by dxdt\frac{dx}{dt}. So, dydx=dydtdxdt=t(13t23)=3t53\frac{dy}{dx} = \frac{\frac{dy}{dt}}{\frac{dx}{dt}} = \frac{t}{\left(\frac{1}{3}t^{-\frac{2}{3}}\right)} = 3t^{\frac{5}{3}}.
  5. Find t Value: We need to find the value of tt that corresponds to the point (2,31)(2,31). Since x=t3x = \sqrt[3]{t}, we solve the equation 2=t32 = \sqrt[3]{t} to find tt. Cubing both sides gives us t3=8t^3 = 8, so t=2t = 2.
  6. Calculate Slope: Now we substitute t=2t = 2 into the derivative dydx\frac{dy}{dx} to find the slope of the tangent line at the point (2,31)(2,31). The slope mm is 3(2)533*(2)^{\frac{5}{3}}.
  7. Use Point-Slope Form: Calculating the slope mm, we get m=3(2)53=3(253)=3(22213)=3423=1223m = 3\cdot(2)^{\frac{5}{3}} = 3\cdot(2^{\frac{5}{3}}) = 3\cdot(2^{2}\cdot2^{\frac{1}{3}}) = 3\cdot4\cdot\sqrt[3]{2} = 12\cdot\sqrt[3]{2}.
  8. Substitute Values: With the slope m=1223m = 12\sqrt[3]{2} and the point (2,31)(2,31), we can use the point-slope form of the equation of a line to find the equation of the tangent line: yy1=m(xx1)y - y_1 = m(x - x_1), where (x1,y1)(x_1, y_1) is the point (2,31)(2,31).
  9. Simplify Equation: Substituting the values into the point-slope form, we get y31=1223(x2)y - 31 = 12\sqrt[3]{2}(x - 2).
  10. Final Tangent Line Equation: To simplify, we distribute the slope on the right side of the equation: y31=1223x2423y - 31 = 12\sqrt[3]{2}x - 24\sqrt[3]{2}.
  11. Final Tangent Line Equation: To simplify, we distribute the slope on the right side of the equation: y31=1223x2423y - 31 = 12\sqrt[3]{2}x - 24\sqrt[3]{2}. Finally, we add 3131 to both sides to get the equation of the tangent line in slope-intercept form: y=1223x2423+31y = 12\sqrt[3]{2}x - 24\sqrt[3]{2} + 31.

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