Question

simplify : (2-√5) ^2​

Answer 1

Answer:

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

Answer 2

Answer:

${(2 - \sqrt{5} )}^{2} = {2}^{2} + { \sqrt{5} }^{2} - 2(2) (\sqrt{5} ) \\ = 4 + 5 - 4 \sqrt{5} \\ = 9 - 4 \sqrt{5} \\ = 9 - 4(2.2) \\ = 9 - 8.8 \\ = = > 0.2$

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