Mathematics
Junior High

四角で囲った式がどうしても答えと一致しないので途中式を教えて下さい💦

p² = (4√√2-r)² + 2² 2√2r=9 -94/2 9√2 r = ZV S

Answers

(x+y)²=x²+2xy+y²
     ↑
     真ん中の計算忘れてるとかかな?

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