(2√18+3√8)+(3√22-√50)

(2√18 + 3√8) + (3√22 - √50) = (2√(9 * 2) + 3√(4 * 2)) + (3√22 - √(25 * 2)) =(2√9 * √2 + 3√4 * √2) + (3√22 - √25 * √2) = (2 * 3√2 + 3 * 2√2) + (3√22 - 5√2) =  (6√2 + 6√2) + (3√22 - 5√2) = 12√2 + (3√22 - 5√2) = 12√2 + 3√22 - 5√2 = 12√2 - 5√2 + 3√22 = 7√2  + 3√22 .