2. 外语
  3. For the function f(x)= x2 + x, what is the value of f(-5)?

For the function f(x)= x2 + x, what is the value of f(-5)?

admin2013-02-19  33
问题 For the function f(x)= x2 + x, what is the value of f(-5)?
选项
答案20
解析 To solve, substitute -5 for x in the function:
f(-5)=(-5)2 +(-5)
f(-5)= 25-5
f(-5)= 20
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