Question

a=3-2√2 find the value of a2-1/a2​

Answer 1

a=3−22a1=3−221=(3+22)(3−22)3+22a1=9−83+22=3+22now.a+a1=3−22+3+22=6a−a1=3−22−3−22=−42thusa2−a21=(a+a1)(a−a1)=6×(−42)=−242

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