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How To Simplify [(1/2)^2-(1/4)^-2, (-3xy^4)-(-4x^3y^6) And (5ab^2/c^3)^2?

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Oddman answered
1) (1/2)2 - (1/4)-2
  = (2-1)2 - (4-1)-2
  = 2-2 - 42
  = 1/4 - 16
  = -15 3/4
  = -63/4

2) Change the sign on the second term and you have it. (-1*-4=+4) The terms don't add. You can factor out xy4, but "simplify" generally means to multiply it out.

3) (5ab2/c3)2 = 25a2b4/c6

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