Question

(3-
$(3 - \sqrt{5) {}^{2} }$
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Answer 1

Answer:

$(3 - \sqrt{5} ) ^{2} \\ \\ = (3) ^{2} - 2 \times 3 \times \sqrt{5} + ( \sqrt{5} ) ^{2} \\ \\ = 9 - 6 \sqrt{5} + 5 \\ \\ = 4 - 6 \sqrt{5} \\ \\ = 2(2 - 3 \sqrt{5} )$

$formula \: used \\ \\ (a - b) ^{2} = a ^{2} - 2 ab + b ^{2}$

hope it helps uH ✔