Question

2 root 5 minus 10 whole square

Answer 1

Answer:

(2√5 -10) ^2 = 20+ 100 -2•2√5•10

= 120 - 40√5

= 120 - 40•2.23

= 30.8 ans

Answer 2

Answer:

120-40$\sqrt{5\\}$

Step-by-step explanation:

$(2\sqrt{5}-10)^{2}$

=$(2\sqrt{5})^{2}$$+10^{2}$$-40\sqrt{5}$

=20+100$-40\sqrt{5\\}$

=120$-40\sqrt{5}$