Question

(b) If a=5-2√5, then find a².​

Answer 1

Answer:

35 + 20$\sqrt{5}$

Step-by-step explanation:

a^2 = $(5-2\sqrt{5} )^{2}$

 From ( a + b)^2 = a^2 + b^2 + 2ab

    = 5^2 +2(5) + 2(5)($2\sqrt{5}$)

    = 35 + 20$\sqrt{5}$

Answer 2

Answer -

45-20root5

Explanation—