Problem

$x^{2}+4 x$

Solution

Step 1 ：f(x)=x^2+4x

Step 2 ：f(4)=4^2+4(4)

Step 3 ：f(4)=16+16

Step 4 ：\(\boxed{32}\)

From Solvely APP
Source: https://solvelyapp.com/problems/13h4k11IAw/

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