Answer:
x+x1=m⟶(x+x1)2=m2⟶x2+x21+2×x×x1=m2⟶x2+x21=m2−2
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Answer:
x+x1=m⟶(x+x1)2=m2⟶x2+x21+2×x×x1=m2⟶x2+x21=m2−2