Prove that (-a,-a/2) is the orthocentre ...

Prove that `(-a,-a/2)` is the orthocentre of the triangle formed by the lines ` y = m_(i) x + a/(m_(i)) , I = 1,2,3, m_(1) m_(2) m_(3) ` being the roots of the equation `x^(3) - 3x^(2) + 2 = 0 `

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