If f (2x) = - 2x ^ 2 + 5x-7, then f (2)=
If f (2x) = - 2x & # 178; + 5x-7
Then f (2) = f (2 * 1) = - 2 * 1 & # 178; + 5 * 1-7 = - 2 + 5-7 = - 4
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