How do you get the answer 20 from \((\pm 2 \sqrt5)^2\)
How do you get the answer 20
\((\pm 2 \sqrt5)^2\\=(\pm 2 \sqrt5)\times(\pm 2 \sqrt5)\\=2*2*\sqrt5*\sqrt5\\=4*5\\=20\)
(2√5)2
= 22 x √52
= 4 x 5
= 20
