The value of the polynomial $2 x^{5} - 5 x^{3} - 10 x + 9$ when $x = - 1$

21

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22

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23

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None of the above

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Solution

The correct option is A $22$
$f (x) = 2 x^{5} - 5 x^{3} - 10 x + 9$
$f (- 1) = 2 (- 1)^{5} - 5 (- 1)^{3} - 10 (- 1) + 9$
$f (- 1) = 2 (- 1) - 5 (- 1) + 10 + 9$
$f (- 1) = - 2 + 5 + 19$
$f (- 1) = 22$

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