Answer
$(x+\frac{5}{2})^{2}$
Work Step by Step
We are given:
$x^2+5x$
We complete the square:
$x^{2}+5x+\frac{25}{4}$
$x^{2}+5x+(\frac{5}{2})^2$
$(x+\frac{5}{2})^{2}$
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