$x^{2}+4 x$
Answer
Expert–verified
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Answer
\(\boxed{32}\)
Steps
Step 1 ：f(x)=x^2+4x
Step 2 ：f(4)=4^2+4(4)
Step 3 ：f(4)=16+16
Step 4 ：\(\boxed{32}\)
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