For the function f(x)= x2 - 4x + 8, what is the value of f(6)?

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问题 For the function f(x)= x2 - 4x + 8, what is the value of f(6)?

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答案20

解析 To solve, substitute 6 for x in the function:
f(6)= 62 - 4(6)+ 8
f(6)= 36-24 + 8
f(6)= 20
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