simplify : root 72 + root 800 - root 18
sqrt(72) + sqrt(800) - sqrt(18) =
sqrt (36 * 2) + sqrt (16 * 25 * 2) - sqrt(9 * 2) =
6 sqrt (2) + sqrt (16) * sqrt(25) * sqrt(2) - 3 sqrt(2) =
6 sqrt(2) + (4 * 5 )sqrt (2) - 3 sqrt (2) =
8 sqrt (2) + 20 sqrt (2) - 3 sqrt (2) =
25 sqrt (2)
