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Can someone explain how they got 10 in 8 - 10 + 1 = -1?
Thanks!

Can someone explain how they got 10 in 8 - 10 + 1 = -1? Thanks!-example-1

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Explanation:

2x^2 - 5x +1 = f(x) <====== put in '2' for 'x'

2 ( 2^2) - 5 * (2) + 1

2 ( 4 ) - 10 + 1

8 - 10 + 1 = -1

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