Verified answer

Ответ:

[tex] \sqrt{98} = \sqrt{49} \times \sqrt{2} = 7 \sqrt{2} [/tex]

[tex] \sqrt{50} = \sqrt{25} \times \sqrt{2} = 5 \sqrt{2} [/tex]

[tex]7 \sqrt{2} - 5 \sqrt{2} = 2 \sqrt{2} [/tex]