What is the value of a, if $- 32^{2} - (- 12)^{2} + a (10)^{2} = 2168$ ?

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-10

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33.36

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Solution

The correct option is C 33.36
$- 32^{2} - (- 12)^{2} + a (10)^{2} = 2168$
$- 1024 - 144 + 100 a = 2168$
$100 a = 2168 + 1168$
$100 a = 3336$
$a = 33.36$

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