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Consider the curve given by the equation 
3x^(2)+y^(4)+6x=253. It can be shown that

(dy)/(dx)=(-6(x+1))/(4y^(3))
Write the equation of the horizontal line that is tangent to the curve and is above the 
x-axis.

Consider the curve given by the equation 3x2+y4+6x=253 3 x^{2}+y^{4}+6 x=253 . It can be shown that dydx=6(x+1)4y3. \frac{d y}{d x}=\frac{-6(x+1)}{4 y^{3}}. \newlineWrite the equation of the horizontal line that is tangent to the curve and is above the x x -axis.

Full solution

Q. Consider the curve given by the equation 3x2+y4+6x=253 3 x^{2}+y^{4}+6 x=253 . It can be shown that dydx=6(x+1)4y3. \frac{d y}{d x}=\frac{-6(x+1)}{4 y^{3}}. \newlineWrite the equation of the horizontal line that is tangent to the curve and is above the x x -axis.
  1. Find Tangent Point: To find the equation of a horizontal line that is tangent to the curve, we need to find a point on the curve where the derivative dydx\frac{dy}{dx} is equal to 00, because the slope of a horizontal line is 00.
  2. Derivative Calculation: The derivative dydx\frac{dy}{dx} is given as 6(x+1)4y3\frac{-6(x+1)}{4y^3}. For a horizontal tangent line, dydx\frac{dy}{dx} must be equal to 00. Therefore, we set the numerator of the derivative equal to zero to find the xx-value of the point of tangency.\newline6(x+1)=0-6(x+1) = 0
  3. Solve for x: Solving for x, we get:\newline6(x+1)=0-6(x+1) = 0\newline6x6=0-6x - 6 = 0\newline6x=6-6x = 6\newlinex=1x = -1
  4. Find y-Value: Now that we have the x-value, we need to find the corresponding y-value(s) on the curve. We substitute x=1x = -1 into the original equation of the curve to find yy.3(1)2+y4+6(1)=2533(-1)^2 + y^4 + 6(-1) = 253
  5. Simplify Equation: Simplifying the equation, we get:\newline3(1)+y46=2533(1) + y^4 - 6 = 253\newline3+y46=2533 + y^4 - 6 = 253\newliney4=253+63y^4 = 253 + 6 - 3\newliney4=256y^4 = 256
  6. Solve for yy: Taking the fourth root of both sides to solve for yy, we get:\newliney=±4y = \pm 4\newlineSince we are looking for the horizontal tangent line above the x-axis, we only consider the positive yy-value.\newliney=4y = 4
  7. Equation of Tangent Line: We now have the point of tangency (1,4)(-1, 4). The equation of a horizontal line is of the form y=ky = k, where kk is the yy-coordinate of the point through which the line passes.\newlineTherefore, the equation of the horizontal line tangent to the curve and above the xx-axis is y=4y = 4.

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