Question

let n=5

what is the value of the expression 9n^2 -2 -n?

please help

Answer 1

9(5)^2 - 2 - (5)

9(25) - 2 - 5

225 - 2 - 5

223 - 5

218

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Answer 2

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Substitute 5 into 'n'

9(5)^2 - 2 - 5 = 218

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