✨ Best Answer ✨
(a+b)^2=a^2+2ab+b^2 なので、
(2+√5)^2=2^2+2×2×√5+(√5)^2=4+4√5+5=9+4√5 です。
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✨ Best Answer ✨
(a+b)^2=a^2+2ab+b^2 なので、
(2+√5)^2=2^2+2×2×√5+(√5)^2=4+4√5+5=9+4√5 です。
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are also looking at these questions 😉
