Question

A) raiz de 32 - raisz de 50+ raiz de 98- raiz de 18=

Answer 1

V32 - V50 + V98 - V18 =
V16.2 - V25.2  + V49.2 + V9.2 =
4V2 - 5V2 + 7V2 + 3V2 =
14V2 - 5V2 = 9V2

Answer 2

$\sqrt{32} - \sqrt{50} + \sqrt{98} - \sqrt{18} = \sqrt{2^2*2^2*2} - \sqrt{2*5^2} + \sqrt{2*7^2} - \sqrt{2*3^2} = 4\sqrt{2} - 5\sqrt{2} + 7\sqrt{2} - 3\sqrt{2} = 3\sqrt{2}$