Which expression does not factor? m3 + 1 m3 – 1 m2 + 1 m2 – 1

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In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.