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Chapter 9 Class 12 Differential Equations

Serial order wise

Last updated at Aug. 14, 2023 by Teachoo

Example 8 Find the equation of a curve passing through the point (−2 ,3), given that the slope of the tangent to the curve at any point (𝑥 , 𝑦) is 2𝑥/𝑦^2 Slope of tangent = 𝑑𝑦/𝑑𝑥 ∴ 𝒅𝒚/𝒅𝒙 = 𝟐𝒙/𝒚𝟐 𝑦2 dy = 2x dx Integrating both sides ∫1▒𝒚𝟐 𝒅𝒚= ∫1▒〖𝟐𝒙 𝒅𝒙〗 𝑦^3/3 = 2.𝑥^2/2 + C 𝑦^3/3 = 𝑥^2 + C 𝑦^3 = 〖3𝑥〗^2+3𝐶 𝒚^𝟑 = 〖𝟑𝒙〗^𝟐+𝑪𝟏 where 𝐶1 = 3C Given that equation passes through (−2, 3) Putting x = −2, y = 3 in (1) y3 = 3x2 + C1 33 = 3(−2)2 + C1 27 = 3 × 4 + C1 27 − 12 = C1 15 = C1 C1 = 15 Putting C1 in (1) y3 = 3x2 + 15 y = "(3x2 + " 〖"15)" 〗^(𝟏/𝟑) " "is the particular solution of the equation.