Problem 3 We assume y₁(x) solve the following differential equation: y" + P(x)y' + Q(x)y = 0, then we can find another solution y₂(x), using the following formula: e Y2(T) = Y1(T) | ² -dr. SP(z)dz y? We now consider to find the general solution to the equation y" - 4y + 4y = 0. (2.1) Show that y₁(x) = e²¹ is a solution of (1). (2.2) Using the formula we have above, find y2(x)

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