Geometry

(5d + 5) - (d +1)

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asked by Jacob
  1. 5 d + 5 - d - 1

    4 d + 4

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    posted by Damon
  2. (5d + 5) - (d +1)
    = 5d + 5 - d - 1
    = 4d + 4
    or
    = 4(d+1)

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    posted by Reiny
  3. to convince yourself pick some number for d, like 12

    (60+5) - (12+1)

    65 - 13

    52

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    now is that the same as
    4(12) + 4 ????

    48 + 4

    52 sure enough

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    posted by Damon

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