Question

(√40+4)во 2 степени помогите срочно !!!!!!

Answer 1

(√40 + 4)² = (√40)² + 8√40 + 16 = 40 + 8·2√10 + 16 = 56 + 16√10.

Answer 2

(a+b)²=a²+2ab+b²
$( \sqrt{40}+4)^2=( \sqrt{40})^2+2* \sqrt{40}*4+4^2=40+8 \sqrt{40}+16=56+8 \sqrt{40}$$=56+8 \sqrt{4*10}=56+8*2 \sqrt{10}=8(7+2 \sqrt{10})$