Tangents

Calculus Level 3

If two tangents can be drawn from point $$(h,2-5h)$$ $$\forall \ h \in \mathbb R-\{ 1\}$$ to $$y = x^3-3x^2 -ax+b$$. Then find $$ab + a + b$$.

 Notation: $$\mathbb R$$ denotes the set of real numbers.

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