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Find the equation of the curve for which 
y^('')=(4)/(x^(3)) and which is tangent to the line 
2x+y=5 at the point 
(1,3).

Find the equation of the curve for which y=4x3 y^{\prime \prime}=\frac{4}{x^{3}} and which is tangent to the line 2x+y=5 2 x+y=5 at the point (1,3) (1,3) .

Full solution

Q. Find the equation of the curve for which y=4x3 y^{\prime \prime}=\frac{4}{x^{3}} and which is tangent to the line 2x+y=5 2 x+y=5 at the point (1,3) (1,3) .
  1. Integrate to find derivative: Integrate the second derivative to find the first derivative.\newlineGiven y=4x3y'' = \frac{4}{x^3}, we integrate to find yy'.\newline(4x3)dx=4x3dx\int(\frac{4}{x^3})dx = \int 4x^{-3}dx\newliney=2x2+C1y' = -2x^{-2} + C_1\newlineWe need to find the constant C1C_1.
  2. Find constant C1C_1: Use the point of tangency to find the first constant C1C_1. The curve is tangent to the line 2x+y=52x + y = 5 at the point (1,3)(1,3). This means that the derivative of the curve at x=1x = 1 should be equal to the derivative of the line at that point. The derivative of the line 2x+y=52x + y = 5 is 2-2 (since dydx=2\frac{dy}{dx} = -2 when we differentiate 2x+y=52x + y = 5 with respect to xx). So, C1C_100 should equal C1C_111. C1C_122 C1C_133
  3. Integrate for original function: Integrate the first derivative to find the original function yy. Now that we have y=2x2y' = -2x^{-2}, we integrate to find yy. (2x2)dx=2x2dx\int(-2x^{-2})dx = \int-2x^{-2}dx y=2x1+C2y = 2x^{-1} + C_2 We need to find the constant C2C_2.
  4. Find constant C2C_2: Use the point of tangency to find the second constant C2C_2. The curve passes through the point (1,3)(1,3), so we can use this to find C2C_2. y(1)=3y(1) = 3 should equal 2(1)1+C22(1)^{-1} + C_2. 3=2+C23 = 2 + C_2 C2=1C_2 = 1
  5. Write final curve equation: Write the final equation of the curve.\newlineNow that we have both constants, we can write the equation of the curve.\newliney=2x1+1y = 2x^{-1} + 1\newlineOr, in a more conventional form:\newliney=2x+1y = \frac{2}{x} + 1