a)
[tex] \sqrt{50} = \sqrt{25 \times2 } = 5 \sqrt{2} [/tex]
[tex]5 \sqrt{2} \approx7[/tex]
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b)
[tex] \sqrt{50 } = 5 \sqrt{2} \approx7 \\ \\ 2 \times \sqrt{25} = 2 \times 5 = 10[/tex]
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