# How do you simplify 5√2 + 4√2?

$9 \sqrt{2} \approx 12.727922061$
Value $= 5 \sqrt{2} + 4 \sqrt{2}$
$= \sqrt{2} \left(5 + 4\right) = \sqrt{2} \times 9$
$= 9 \sqrt{2} \approx 12.727922061$