Răspuns:
[tex] \sqrt{150 = \: \: } 5 \sqrt{6} [/tex]
[tex] \sqrt{28 \: = } 2 \sqrt{7} [/tex]
[tex] - \sqrt{98} = | - \sqrt{98} | = | \sqrt{98} | = \sqrt{98} = 7 \sqrt{2} [/tex]
[tex] - \sqrt{7 {}^{2} } = | - \sqrt{7} | = | \sqrt{7} | = \sqrt{7} [/tex]
