Răspuns:
a)
[tex]2 \sqrt{5} = \sqrt{ {2}^{2} \times 5} = \sqrt{20} [/tex]
b)
[tex]7 \sqrt{2} = \sqrt{ {7}^{2} \times 2 } = \sqrt{98} [/tex]
c)
[tex]3 \sqrt{7} = \sqrt{ {3}^{2} \times 7 } = \sqrt{63} [/tex]
d)
[tex]4 \sqrt{6} = \sqrt{ {4}^{2} \times 6 } = \sqrt{96} [/tex]
