Question

5 under root 7 minus 2 under root 5 whole square
$(5 \sqrt{7} - 2 \sqrt{5} ) {}^{2}$
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Answer 1

Answer:

195-20$\sqrt{25\\}$

or ≈76.68

Step-by-step explanation:

Answer 2

$using \: the \: formula \: {(a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab \\ here \: a = 5 \sqrt{7} \: and \: b = 2 \sqrt{5} \\ now \: applying \: the \: formula; \\ {(5 \sqrt{7 } - 2 \sqrt{5} )}^{2} = {(5 \sqrt{7} )}^{2} + {(2 \sqrt{5} )}^{2} - 2(5 \sqrt{7} \times 2 \sqrt{5} ) \\ = > 175 + 20 - 2(10 \sqrt{35} ) \\ = > 190 - 20 \sqrt{35}$

Answer: 190 -20√35