Simplify and find the value of $4 x + x - 2 x^{2} + x - 1$ , when $x = - 1$ .

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Solution

Expression $= - 2 x^{2} + 6 x - 1$ when $x = - 1$ it becomes $- 2 (- 1)^{2} + 6 (- 1) - 1 = - 2 - 6 - 1 = - 9$ .

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