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Differential-Equations · Differential-Equations

Y'' = -2

\frac{d^{2}}{d x^{2}} y{\left(x \right)} = -2

Step by step

  1. \frac{d^{2}}{d x^{2}} y{\left(x \right)} = -2

    The differential equation.

  2. \text{order } 2

    Order 2: the highest derivative present.

  3. \text{Undetermined coefficients}

    Solve the homogeneous part from the characteristic equation, then guess a particular solution shaped like the right-hand side.

  4. r^{2} = 0

    Characteristic equation of the homogeneous part (substitute y = e^{rx}).

  5. r = 0\ (\times 2)

    Its roots.

  6. y{\left(x \right)} = C_{1} + C_{2} x - x^{2}

    General solution (C₁, C₂ … are arbitrary constants).

  7. \checkmark

    Verified: substituting the solution back into the equation gives 0.

Reveal the answer
y{\left(x \right)} = C_{1} + C_{2} x - x^{2}