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xz + 2x = (z+2)x
The distributive principle (used in reverse).
Usually the distributive principle is written
x(z + 2) = xz + 2z
where we say
The x multiplier in front of the parentheses
distributes as a multiplier to the z giving xz,
then it also distributes as a multiplier to the
2 giving 2z. But x(z+2) can also be written
as (z+2)x by the commutative principle, and
the right and left sides of the equation can
be reversed and we get:
xz + 2x = (z + 2)x
Edwin
