find the derivative x^2e^x
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Let y = (x−a)(x−b)
⇒y = x(x−b)−a(x−b)
⇒y =
x
2
−bx−ax+ab
⇒y =
x
2
− (a+b)x + ab
⇒
dy
dx
= 2x −(a+b)
⇒y = x(x−b)−a(x−b)
⇒y =
x
2
−bx−ax+ab
⇒y =
x
2
− (a+b)x + ab
⇒
dy
dx
= 2x −(a+b)
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