✨ Best Answer ✨
(a-b)^2=a^2-2ab+b^2より
(2√2-1)^2=(2√2)^2-2×2√2×1+(1)^2
=8-4√2+1
=9-4√2
Answers
Were you able to resolve your confusion?
Users viewing this question
are also looking at these questions 😉
Recommended
詳説【数学Ⅰ】第一章 数と式～整式・実数・不等式～
8992
117
数学ⅠA公式集
5738
20
詳説【数学Ⅰ】第三章 図形と計量（前半）～鋭角鈍角の三角比～
4580
11
詳説【数学Ａ】第３章 平面図形
3627
16