Final Answer
$x^2+8x+16$
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Step-by-step Solution
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1
When multiplying two powers that have the same base ($x+4$), you can add the exponents
$\left(x+4\right)^2$
2
A binomial squared (sum) is equal to the square of the first term, plus the double product of the first by the second, plus the square of the second term. In other words: $(a+b)^2=a^2+2ab+b^2$
$x^2+8x+16$
Final Answer
$x^2+8x+16$