Question

If a = 5-2 under root 5,then find a²

Answer 1

Step-by-step explanation:

$a = 5 - 2 \sqrt{5} \\ {a}^{2} = {(5 - 2 \sqrt{5}) }^{2} \\ {a}^{2} = 25 - 20 \sqrt{5} + 4 { (\sqrt{5}) }^{2} \\ {a}^{2} = 25 - 20 \sqrt{5} + 20 \\ {a}^{2} = 45 - 20 \sqrt{5}$

Answer 2

Answer:

i hope it is the correct answer