Explicație pas cu pas:
a.
[tex]x {}^{2} = 4 \times 16 \\ x { }^{2} = 64 \\ x = \sqrt{64 } \\ x = 8[/tex]
b.
[tex]x {}^{2} = 4 \times 9 \\ x {}^{2} = 36 \\ x = \sqrt{36} \\ x = 6[/tex]
C.
[tex]x {}^{2} = 3 \times 5 \\ x {}^{2} = 15 \\ x = \sqrt{15} \\ [/tex]
d.
[tex]x {}^{2} = 25 \times 8 \\ x {}^{2} = 5 {}^{2} \times 2 {}^{2} \times 2 \\ x = 5 \times 2 \sqrt{2} \\ x = 15 \sqrt{2} [/tex]
e.
[tex]x {}^{2} = 2 \sqrt{5} \times \sqrt{45} \\ x {}^{2} = 2 \sqrt{5} \times 3 \sqrt{5} \\ x {}^{2} = 30 \\ x = \sqrt{30} [/tex]
f.
[tex]x {}^{2} = \frac{11}{4} \times 11 \\ x {}^{2} = \frac{11 {}^{2} }{4} \\ x = \sqrt{ \frac{121}{4} } \\ x = \frac{11}{2} [/tex]
